kb of nano2

This equation is used to find either K a or K b when the other is known. Stomach Antacids. Calculation of the Buffer Capacity. Ka and Kb values measure how well an acid or base dissociates. sognare di vedere panni stesi calcolare il ph della soluzione ottenuta mescolando ml 175 calcolare il ph della soluzione ottenuta mescolando ml 175 H 2 C 2 O 4. arrow_forward. if Kb NH3= 18 x 10-5. NaNO2 yields NO2 - + Na+ The salt NaNO2 completely ionizes, producing 0.35M [NO2-] and 0.35 [Na+] ions. For (b), the volume of H C l added is required, as the concentration of the solution alone is not sufficient information. Take 0.1 N KMnO4 in a iodometric flask. Type in your own numbers in the form to convert the units! HCl + NH 3 NH 4+ + Cl -. Calculate the pH using Ka or Kb in the following. 0.10 M HNO3. Kb (NH3) = 1.8 x 10-5. 1. Rajeshwer Rao. 1 n = 1.0E-12 k 1 k = 1000000000000 n. Example: convert 15 n to k: 15 n = 15 1.0E-12 k = 1.5E-11 k. Convert Nano to Other Prefixes Units Relating pH and pKa With the Henderson-Hasselbalch Equation. Our stomachs contain a solution of roughly 0.03 M HCl, which helps us digest the food we eat. CLICK ON IMAGE TO ENLARGE. 4 moles NaNO2 to grams = 275.98108 grams. It has more or less the same functionality of the Arduino Duemilanove, but in a different package. which in turn makes its ka practically zero. Chem 360 Jasperse Ch. View the full answer. The temperature dependence of the damping constant is calculated for some Raman modes in NaNO2 using the soft modehard mode coupling model and the energy fluctuation model. (c) If a small amount of HCl is added, the pH decreases very slightly. If 0.40 mol of NaOH are added to this solution, and the final volume is 1L, which of the following statements is FALSE? Answer: Equilibrium: NO2- + H2O HNO2 + OH- Kb = [HNO2][OH-]/[NO2-] The value of Kb can be calculated from the value of Ka of the conjugate acid since: Ka X Kb = 1.00X10^-14 Kb = 1.00X10^-14 / 4.60X10^-4 = 2.17X10^-11 Now, let [HNO2] = [OH-] = x, and [NO2-] = 0.148-x. Part 3: fill in the following chart Substance -[H 3 O+] [OH ] pH pOH HCl 2.50 x 10-2 H 2 SO 4 5.62 x 104 NaOH 9.82 NH 4 OH 3.64 9. . pka = -log(ka) So pka = -log(0) so pka for practical purposes can be treated as infinite. In aqueous solution the following mjor species are present. Second, Ka and Kb are used to describe weak electrolytes. If you just keep it at this temp. Compound. This compound is also known as Sodium Nitrite. the negative log of the water ion product , Kw. Amines 2 3. 5 Systematic Approach to Equilibrium Problems 1. Alkylation of 1 Alkyl Halides (Section 19-12, 19-21A) R Br RN H H N H R H X ammonium salt R 3a. If an acid has a Ka of 4.3 10-7 and a base has a Kb of 5.6 10-4, then what will be true about the salt produced? Sodium acetate is the salt of a weak acid and strong base from the equation: C_(2)H_(3)NaO_2->CH_3COO^(-)+Na^(+), where: CH_3COO^(-)+H_2O\\\\rightleftharpoonsCH_3COOH+OH^(-) As it is a weak acid and strong base, this is a good indicator of a fairly high pH. Chemistry. 6 So the concentration of excess acid is 0.0412 mol = 0.0916 M 0.0450 L Since the excess acid is a strong acid, pH = - log 10 (0.0916) = 1.04 d) At the equivalence point neutralization has occurred, and so what is present is a Download Download PDF. Aniline, C6H5NH2, is an important organic base used in the manufacture of dyes. The Ka of nitrous acid is 4.0*10^-4. [H 3 O +] = (5.6 x 10-10)(0.0235/0.0415) = 3.17 x 10-10 pH = 9.50 Top. Acid with values less than one are considered weak. A chemical bond is a lasting attraction between atoms, ions or molecules that enables the formation of chemical compounds. This Paper. HCO 3-+ OH-HCO 3-! Note how Nan02 offers more DO per kwh, elevated dissolved oxygen concentration, enhanced transfer efficiency, and size of the micro-nanobubbles. Add sample to this in iodometric flask. Question & Answer: The pH of a solution containing 2.0 mole HNO2 and 2.0 mole NaNO2 from Chemistry subject - 00300358. Get control of 2022! Page 4 of 5 Chem201 Winter 2006 CO 3 2-! The Kb for ammonia = 1.8 X 10 -5. 1 answer. o With excess alkyl halide and base, keep on alkylating until it becomes the Ka for HN02 is 10-4 Step 2: Define the unknown's equation. The micro nano-bubbles in NanO2 oxygen-water emulsions range from a few nanometers to microns in diameter, resulting in a reduced rate of rise, and minimizing losses to off gassing. study resourcesexpand_more A solution is 0.25 M HNO2 and 0.24 M NaNO2. 6 moles NaNO2 to grams = 413.97162 grams. What is chemical bond, ionic bond, Molecular bond? The damping constant is fitted to the measured Raman bandwidths of those First week only $4.99! Effect of NaNO2 on the activities of major antioxidant defense enzymes in rat intestinal homogenates. Convert grams NaNO2 to moles or moles NaNO2 to grams. Given that, Molarity of NaNO2 = 0.400 M pH of NaNO2 = 8.42 Kb of NaNO2 = ? (a) If a small amount of NaOH is added, the pH decreases very slightly. 3 10. Answer (1 of 2): [\text{NaNO}_2]=0.08\text{ M} pK_a=3.22 pH? A: In this question, we will determine the pH write. a. pOH is the negative of the logarithm of the hydroxide ion concentration: Sodium nitrite (NaNO2) is a strong electrolyte and soluble in water. A mixture of a weak acid and its conjugate base (or a mixture of a weak base and its conjugate acid) is called a buffer solution, or a buffer. 3.Equilibrium-constant expressions 4. 2) 5.6 10 -11. citric acid. Emoticon Emoticon. A. Enter a chemical formula to calculate its molar mass and elemental composition: Molar mass of NaNO2 is 68.99527 0.00080 g/mol. Solution for Determine the pH of the molecules given in a 1L beaker containing 0.035M solution of the given molecule: NaNO2, C6H5CHCOOH, Ba(OH)2. Third, substitute into the K a expression and solve for the hydronium ion concentration. This page looks at reactions of phenylamine (also known as aniline or aminobenzene) where it behaves as a fairly straightforward primary amine. Chemical bond. Predict if the solutions of the following salts are neutral, acidic or basic: NaCl, KBr, NaCN, NH4NO3, NaNO2 and KF. The Arduino Nano is a small, complete, and breadboard-friendly board based on the ATmega328 (Arduino Nano 3.x). Ka 1.8 x N Hg+ b) Nas cr C H.b) H c + 5) On, Of a M a Of 8.5 x 10-8 Kal 7.9 x 104 tor 1 s x 10-12 0.270 0.270 20 x 10-5 M . The relationship between Ka and Kb for any conjugate acid-base pairs is as follows: (K a)(K b) = K w. Where K a is the ionization constant of the acid form of the pair, K b is the ionization constant for the base form of the pair, and K w is the ionization constant for water. H 3 O + + OH- (Note: the water equilibrium is irrelevant in this system, since the solution is buffered at pH 6.000, fixing the hydrogen ion and hydroxide ion concentrations.) Sodium Nitrite MATERIAL SAFETY DATA SHEET CAS No 7632-00-0 SD Which of the following statements is true? Solution: 1) After adding the HCl, the solution will contain some propanoic acid and some sodium propionate (the NaC 3 H 5 O 2).The solution is a buffer and we will use the Henderson-Hasselbalch equation at the end to get the pH. Removed. Problem 26 A formic acid solution has a pH of 3.25. The kinetics of the reaction depicted first order dependence on [S], 28 Full PDFs related to this paper. Peroxy sulfates (PS) like peroxydisulfate (PDS), and peroxymosulfate (PMS) have been accomplished as an efficient reagents for KHSO4/NaNO2 mediated nitration of aromatic compounds (S) such as phenols in aqueous bisulfate and acetonitrile medium, under the conditions [NaNO2] [PS]. Explore more content. TABLE OF CONJUGATE ACID-BASE PAIRS Acid Base K a (25 oC) HClO 4 ClO 4 H 2 SO 4 HSO 4 HCl Cl HNO 3 NO 3 H 3 O + H 2 O H 2 CrO 4 HCrO 4 1.8 x 101 H 2 C 2 O 4 (oxalic acid) HC 2 O 4 5.90 x 102 [H 2 SO 3] = SO 2 (aq) + H2 O HSO NaNO2. 5 moles NaNO2 to grams = 344.97635 grams. By Bagus Amin - 4:54 PM - Add Comment. (a) (8 points) What is the pH of a buffer solution prepared from adding 60.0 mL of 0.36 M ammonium chloride (NH 4Cl) solution to 50.0 mL of 0.54 M Molecular weight calculation: 22.98977 + 14.0067 + 15.9994*2. 4. 2) 1.8 10 -5. MedPR. b. the Kb of HNO2 to find the hydronium concentration. Calculate the hydrogen ion concentration in this solution. * Compiled from Appendix 5 Chem 1A, B, C Lab Manual and Zumdahl 6th Ed. CLICK ON IMAGE TO ENLARGE. Ka and Kb values measure how well an acid or base dissociates. Higher values of Ka or Kb mean higher strength. General Ka expressions take the form Ka = [H3O+][A-] / [HA]. General Kb expressions take the form Kb = [BH+][OH-] / [B]. It is consumed almost exclusively to produce Nylon-6. asked Feb 12, 2020 in Chemistry by Nishu03 (64.2k points) equilibrium; class-11; 0 votes. What is the pH of the solution. Get PDF (233 KB) Abstract. 1) 4.3 10 -7. NO2- is the conjegate base of the weak acid HNO2. 4. a) Calculate the pH of a solution that is 0.60 M HNO2 and 0.40 M NaNO2. 19 Notes + Answers. M 0.051 0.065 0.0286. Step 2: Now click the button Calculate to get the pH value. pH = -log [H 1+] where [H 1+] means the molar concentration of hydronium ions, M = moles / liter. Please register to post comments. Show all of your steps clearly. 1 grams NaNo2 is equal to 0.0018484637888809 mole. SN Applied Sciences, 2019. 3 moles NaNO2 to grams = 206.98581 grams. Answer (1 of 9): NaOH is a strong base so it will disassociate 99.99999999% in aqueous solution. August 28, 2009 [PROBLEM SET FROM R. CHANG TEST BANK] www.kau.edu.sa/aasiri2 3 10. Molar mass of NaNO2 = 68.99527 g/mol. Newer Post Browse. molecular weight of NaNo2 or mol The SI base unit for amount of substance is the mole. The material is a white crystalline, hygroscopic compound. Hydroxylamine is almost always provided and used as an aqueous solution. This is the exact question I faced on an exam: Calculate the $\mathrm{pH}$ of $\pu{0.05 M}~\ce{Na2CO3}. NaNO2 + KMnO4 + H2SO4 = NaNO3 + MnSO4 + K2SO4 + H2O | Chemical reaction and equation. #N#. #"Z"^-# is a weak base. Given Salt SnCl2*2H2O KNO3 Al(NO3)2*9H2O NaNO2 NaCO3 Hydrolysis MW (g/mol) Ka pKa = dataset. Water boils at approximately 366.9K at Lake Tahoe (P=0.809 bar). The buffer capactity refers to the maximum amount of either strong acid or strong base that can be added before a significant change in the pH will occur. As for strong bases - NaOH, KOH, LiOH, Ca (OH) 2 - pK b values read explanation in our FAQ section. So the negative log of 5.6 times 10 to the negative 10. PHENYLAMINE AS A PRIMARY AMINE. An aqueous solution prepared by dissolving 0.350 mol of #"NaZ"# in sufficient water to yield 1.0 L of solution has a pH of 8.93 at 25.0 C. Cite Download (9.5 kB)Share Embed. (v) NaNO2 . Solutions for the Calculation of pH in buffer systems 1. 7 moles NaNO2 to grams = 482.96689 grams. pOH = -log [OH-] the negative log of the hydroxide ion molarity. 2) 1.8 10 -5. 1) 8.4 10 -4. b. Besides, difference between pK a =-1 and pK a =-10 influences calculation results for the solutions with high ionic strength, which are dubious in any case. 5. Carbon is used in 10% excess. HOW many moles of NaOH should be added to a I O) liter Of O M HN02 to prcxiu a solution Of pH4 80? To find the pH of a solution of NaNO2, one would have to construct an ICE chart using: a. the Kb of NO2 to find the hydroxide concentration. Hydrazine is mainly used 3. Sodium nitrite is prepared by a reaction of sodium nitrate and carbon: NaNO3 + C NaNO2 + CO2 Calculate the masses of reactants needed for the preparation of 10 g of NaNO2. Buffers- Common Ion effect IS this Correct Calculate the pH of a aqueous solution containing 0.15 M HNO2 and 0.20 M NaNO2 (aq). (b) If NaOH is added, the OH - ions react with the CH 3 COO - ions. NaNO3 --> NaNO2 If you simply heat NaNO3, it will melt and then at a certain temp (I forget what) will begin to release little bubbles of O2. Strong acids are listed at the top left hand corner of the table and have Ka values >1 2. mmol 1.625 1.625 1.625. ml 31.9 25.0 56.9. Use this page to learn how to convert between grams NaNo2 and mole. Is going to give us a pKa value of 9.25 when we round. S14.3.27. Calculate the pH of a 0.22 M solution of the salt NaNO 2. Molar mass of NaN2 is 51.00317 0.00040 g/mol. H 3 C 6 H 5 O 6. The salt would decrease the pH of the solution. Conjugate acids (cations) of strong bases are ineffective bases. 100% (72 ratings) Answer: Option-1 To find the pH of a solution of NaNO2, one would have to c . Therefore, the electrons on the N-atom are less available to donate. Assume there is no change addition Of NaOH. It is also an intermediate in biological nitrification. How to Convert Nano to Kilo. pK a and pK b values have been taken from various books and internet sources. The pH is roughly 8.96. Hence the aqueous solution of NaNO2 show view the full answer Nitrous acid (as sodium nitrite) is used as part of an intravenous mixture with sodium thiosulfate to treat cyanide poisoning. There also exists a pOH scale - which is less popular than the pH scale. The salt would increase the pH of the solution. So the pH of our buffer solution is equal to 9.25 plus the log of the concentration of A minus, our base. Convert between NaN2 weight and moles. posted on 06.04.2017, 18:24 by Fariheen Aisha Ansari, Shaikh Nisar Ali, Hussain Arif, Aijaz Ahmed Khan, Riaz Mahmood. Calculate the pH at the endpoint of the titration of 25.0 ml of a 0.065 M NH 3 solution with 0.051 M HCl solution. Note that rounding errors may occur, so always check the results. K_b=([HB^+][OH^-])/([B]) where: [B] is the concentration of the Mass-balance expressions for the system Data Charts. Convert between NaNO2 weight and H 3 C 6 H 5 O 6. Calculate the pH of a 0.10 M solution of sodium cyanide, NaCN, solution, pKa = 9.40. Buffer solutions resist a change in pH when small amounts of a strong acid or a strong base are added ( Figure 1 ). In this paper, applications of the methods of ASTM G16 for addressing inherent conflicts in laboratory measurements of corrosion test data were studied, using the inhibiting effect of NaNO2 on the corrosion of concrete steel-rebar for the case study. Because your molarities and volumes of the acid and its conjugate base are equal, this indeed reduces to simply p H = log ( 6.3 10 5). This is a buffer: we have a weak acid, HNO2, and its conjugate base, NO2 [acid] [base] pH = pKa + log (0.60 M) (0.40 M) pH = -log(4.5 x 10-4 ) + log pH = 3.35 + log(0.67) = 3.35 + (-0.18) = 3.17 b) Calculate the pH after 0.01 mol NaOH is added to 500.0 mL of the solution in part A. The pKa for nitrous acid (HNO2) is 3.35. we know the NaNO2 is basic because it yield from NaOH and HNO2, a strong base and a weak acid. View Homework Help - Salt Hydrolysis Spreadsheet.xlsx from CHM 1046L at Florida State University. HNO2 + H20 NaNO2- + H30^+ Inital 0.15 0.20 X Final 0.15 0.20 Ka=. (6 m) 8. (8.13 KB) Related Questions and Answers. Sodium Nitrite NaNO2 Molar Mass, Molecular Weight. (ii) if K b is small, undissociated base is favoured. oding to search: 5 NaNO2 + 2 KMnO4 + 3 H2SO4 = 5 NaNO3 + 2 MnSO4 + K2SO4 + 3 H2O. The pOH of a solution is 9.60. Polyalkylation is routine. Can improve the flavor of cured meat. Balanced chemical equations 2. Close the iodometric flask until bubbling ceases you will have relatively pure NaNO2 on cooling. Related Boards If HNO3, NH4Cl, NaCl, NaNO2, NaOH. To what degree it matters depends on the Ka and Kb of the conjugate acid and conjugate base compared with the concentration of the salt. P Kb of methylamine is lesser than that of aniline: Aniline undergoes resonance and as a result, the electrons on the N-atom are delocalized over the benzene ring. Kinetics and mechanism of peroxysulfate/NaNO2 mediated nitration of phenols in aqueous bisulfate medium. What is the pH scale - So pKa is equal to 9.25. Answer : NaNO2 ( Sodium nitrite ) is base. d. 0.10 M NaNO2. Answer: NaNO2 ( Sodium Nitrite ) is an ionic bond. What is chemical bond, ionic bond, Molecular bond? Chemical bond. A chemical bond is a lasting attraction between atoms, ions or molecules that enables the formation of chemical compounds. (d) If HCl is added, the H + ions react with CH 3 COOH ions. Consider a solution initially containing 0.40 mol fluoride anion and 0.30 mol of hydrogen fluoride (HF). 1) 4.3 10 -7. General Ka expressions take the form Ka = [H3O+][A-] / [HA]. The authors designed a structurally stable nano-in-nano (NANO 2) system highly capable of bioimaging via an aggregation-enhanced NIR excited emission and photoacoustic response achieved based on atomically precise gold nanoclusters protected by linear thiolated ligands [Au 25 (SC n H 2 n +1) 18, n = 416] encapsulated in discoidal phospholipid bicelles To find the pH of a solution of NaNO2, one would have to construct an ICE chart using: a. the Kb of NO2 to find the hydroxide concentration. Weak base + conj acid----> buffer. HNO2 + NaOH = NaNO2 + H2O To determine pH, you can use this pH to H formula: pH = -log ( [H]) If you already know pH, but want to calculate the concentration of ions, use this transformed pH equation: [H +] = 10 -pH. a) Youll essentially have a strong base solution at the end, with 0.7 mol NaF but with 0.1 mol NaOH at the end. learn. Molar Mass, Molecular Weight and Elemental Composition Calculator. Problem #14: Calculate the pH after 0.020 mol of HCl is added to 1.00 L of 0.10 M NaC 3 H 5 O 2.K a = 1.3 x 10-5.. TABLE OF CONJUGATE ACID-BASE PAIRS Acid Base K a (25 oC) HClO 4 ClO 4 H 2 SO 4 HSO 4 HCl Cl HNO 3 NO 3 H 3 O + H 2 O H 2 CrO 4 HCrO 4 1.8 x 101 H 2 C 2 O 4 (oxalic acid) HC 2 O 4 5.90 x 102 [H 2 SO 3] = SO 2 (aq) + H2 O HSO K b, the base dissociation constant or base ionisation constant, is an equilibrium constant that refers to the dissociation, or ionisation, of a base. This means that its kb is practically infinite. Salts can be acidic, neutral, or basic. If 11.3 grams of sample of pyridine is dissolved in 250.0 mL of water, what are 2) 5.6 10 -11. citric acid. This increases the time that dissolved oxygen is available for biological processes, chemical treatment and environmental remediation. C -x x x 5.56 x 10 -10 = x 2 /0.0286. A: given IR and Mass spectrum. H 2 CO 3 + OH- H 2 O + H 2 O ! This allows the definition of the following series of quantities. Search. Share this. What quantity is being sought. Table of Acids with Ka and pKa Values* CLAS * The burning sensation associated with heartburn is a result of the acid of the stomach leaking through the muscular valve at the top of For example: CH3COOH pKa=4.76 c=0.1 HCl pKa=-10 c=0.1 Case 2. 1 mole is equal to 1 moles NaNO2, or 68.99527 grams. Note that rounding errors may occur, so always check the results. Use this page to learn how to convert between moles NaNO2 and gram. Type in your own numbers in the form to convert the units! A: Q: Calculate the pH of 0.0154 M NaN3 Given: Ka of HN3 = 1.9 x 10-5. Full PDF Package Download Full PDF Package. 1 moles NaNO2 to grams = 68.99527 grams. Get your answers by asking now.Join Yahoo Answers and get 100 points molar mass of nano2, The mathematical equation, N = n N A, can be used to find the number of atoms, ions or molecules in any amount (in moles) of atoms, ions or molecules: . B. Hydroxylamine is an inorganic compound with the formula NH2OH. 3) 4.0 10 -6. oxalic acid. Track your food intake, exercise, sleep and meditation for free. NO2- is the conjegate base of the weak acid HNO2. The pKa values for organic acids can be found in Appendix II of Bruice 5th Ed. Step 3: Finally, the pH value will be displayed in the new window. It lacks only a DC power jack, and works with a Mini-B USB cable instead of a standard one. c. the Kb of NO-2, to find the hydronium concentration. ChemiDay you always could xH 2 O).As of 2015, the world hydrazine hydrate market amounted to $350 million. Question & Answer: The pH of a solution containing 2.0 mole HNO2 and 2.0 mole NaNO2 from Chemistry subject - 00300358. Start your trial now! Arrange the acids H2Se, H2Te, and H2S in order of increasing acid strength. pKw = -log Kw. Share on Facebook Tweet on Twitter Plus on Google+. What is the pH of the buffer solution in which the concentration of acetic acid is Chemistry 12 Ka & Kb Calculations 3 of 4 7. Transcript.
Weak acid + conj base -----> buffer. Solution for The ionization constant (Kb) of pyridine (C5H5N) is 5.62 x 10^-4. Read Paper. The pH of a salt solution is determined by the relative strength of its conjugated acid-base pair. This is the exact question I faced on an exam: Calculate the $\mathrm{pH}$ of $\pu{0.05 M}~\ce{Na2CO3}. Solution for Ka for nitrouse acid ,HNO2 is 4.5 x10^-4.what is the value of Kb for the nitrite ion NO2^-close. Md M. Auburn University Main Campus 02:30. 8 moles NaNO2 to grams = 551.96216 grams. NaNo2 For the production of ice dyes, sulph ur dyes, direct dyes, acid dyes, disperse dyes, basic dyes, dye aids, and Hporogens. It has Kb=4.3*10-10. Answer: NaNO2 ( Sodium Nitrite ) is an ionic bond. H 2 C 2 O 4. H2S < H2Se < H2Te. The atomic/molecular masses are: NaNO2= 69.0 g/mol. Can be used as a preservative. So we're gonna plug that into our Henderson-Hasselbalch equation right here. Question : Is NaNO2 ( Sodium nitrite ) an acid or base or neutral ? The procedure to use the pH calculator is as follows: Step 1: Enter the chemical solution name and its concentration value in the respective input field. Compound name is sodium nitrite. Higher values of Ka or Kb mean higher strength. 3) 4.0 10 -6. oxalic acid. NaNo2 Used as a coloring agent in the processing of meat products, it can be used in canned meat and meat products. HONH3. Convert the answer into pH. tutor. Calculate the pH of a 0.15 M aqueous solution of ethylamine, C2H5NH2, Kb = 5.6 x 10^-4. Add / Edited: 05.10.2014 / Evaluation of information: 3.3 out of 5 / number of votes: 3. HNO2 can be determined by volumetric analysis. C. The salt would not affect the pH of the solution. 1) 8.4 10 -4. But Ka of NaNO2=10^ (-3.35)=0.0004467, and Kb=10^ (3.35-14)=2.24*10^ (-11) Which means, for NaNO2, Question: What is the pH of a 0.40 M solution of sodium nitrite, NaNO2? d. the Kb of HNO2, to find the hydroxide concentration. Salts that form from a strong acid and a weak base are acid salts, like ammonium chloride (NH4Cl). Q: Write the oxidation half-reaction and reduction half-reaction, and shorthand electrochemical. (ii) if K b is small, very little of the base is dissociated so the base is weak. (Kb > 1, pKb < 1). NH 4+ W NH 3 + H + Ka = [NH 3 ] [H + ]/ [NH 4+] I 0.0286 0 0. p H = p K a + log ( [ A X ] / [ H A]), comes in handy. D. The pH will increase and then decrease. 2 moles NaNO2 to grams = 137.99054 grams. A 0.40 M solution of the lactate ion (C 3 H 5 O 3-) (a weak base), has a pH of 8.728. a) Calculate the K b of the lactate ion (C 3 H 5 O 3-). A short summary of this paper. Key Concepts.