Chemistry: An Atoms-Focused Approach
14th Edition
ISBN: 9780393912340
Author: Thomas R. Gilbert, Rein V. Kirss, Natalie Foster
Publisher: W. W. Norton & Company
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What is the pH of a buffer solution that is 0.20 M methyl amine, CH3NH2 and 0.18 M methylammonium chloride CH3NH2Cl? The Kb for CH3NH2 is 4.4x10-4. You do not need to solve the quadratic equation for this problem. Express your answer to two decimal places.
Why do buffers have to be made using weak acids and their conjugate bases (or vice versa) as opposed to strong acids and their conjugate bases?
The dissociation (association) of weak acids (bases) is not reversible, but the dissociation (association) of strong acids (bases) is.
Strong acids and bases have K values so small that it is difficult to make Q < K for acid or base ionization.
Correct!
Strong acids and bases have K values so large that it is difficult to make Q > K for acid or base ionization.
Strong acids and bases do not react with other acids and bases.
A chemistry graduate student is given 125. mL of a 0.30M methylamine (CH, NH₂) solution. Methylamine is a weak base with K-44×10 what mass of
CH, NH, Br should the student dissolve in the CH, NH, solution to turn it into a buffer with pH-10.377
You may assume that the volume of the solution doesn't change when the CH, NH, Br is dissolved in it. Be sure your answer has a unit symbol, and round it to
2 significant digits.
Chapter 15 Solutions
Chemistry: An Atoms-Focused Approach
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- c) A student titrated 50.0 mL of a 0.10 M solution of a certain weak acid with NaOH. The results aregiven in the graph above.I) What is the approximate pKa of the acid? II) What specific value from the graph is needed, in addition to the information in partc above, to calculate the molar concentration of the NaOH? III) Identify a pH value between 2.5 and 7.5 at which the concentration of the weak acid beingtitrated is less than the concentration of the conjugate base.arrow_forwardDetermine the [H3O+] of the eight buffer solutions made by mixing 1.10 M acetic acid and 0.900 M sodium acetate solutions according to the following volumes. The pKa for acetic acid, CH3CO2H (HAc), is 4.745. To enter exponential values, use the format 1.0e-5. Someone else on Bartleby posted the answers for the first 3 questions, however, their solution is not clear and thats why I could not finish the remaider of these questions.arrow_forwardWhat is the [H3O+] and the pH of a benzoic acid-benzoate buffer that consists of 0.23 M C6H5COOH and 0.47 M C6H5COONa? (Ka of benzoic acid = 6.3 × 10−5) Be sure to report your answer to the correct number of significant figures. *Can you explain how the molarity of the sodium acetate equals the molarity of the acetate ion?arrow_forward
- Consider the titration of 100.0 mL of 0.100 M HOCI by 0.100 M KOH at 25°C. K, for HOCI = 3.5×10-8. Part 1 Calculate the pH after 0.0 mL of KOH has been added. PH = Part 2 Calculate the pH after 50.0 mL of KOH has been added. pH = Part 3 Calculate the pH after 75.0 mL of KOH has been added. pH = Part 4 Calculate the pH at the equivalence point. pH = Part 5 Calculate the pH after 120 mL of KOH has been added. pH =arrow_forwardWhich of the following mixtures is a buffer and calculate its pH: (Kb=1.8 × 10−5 ) a- 25ml 0.1M HCl mixed with 25ml 0.1M NaOH b- 25ml 0.1M NH3 mixed with 12.5ml 0.1M HCl c- 25ml 0.1M NH3 mixed with 25ml 0.1M NH4Cl d- 25ml 0.1M NH4Cl mixed with 25ml 0.1M NaOHarrow_forwardThe dissociation constant of lactic acid, a monoprotic acid found in sour milk, is 1.4 x 104. A mixture is prepared by dissolving 0.0100 mol of lactic acid and 0.0100 mol NaOH in enough water to form 1.00 L solution. 1. Is the resulting solution a buffer? Explain why or why not. 2. Is the resulting solution acidic, basic or neutral? Explain your answer.arrow_forward
- = O ACIDS AND BASES Calculating the pH at equivalence of a titration A chemist titrates 50.0 mL of a 0.4918 hydrocyanic acid (HCN) solution with 0.8729M KOH Solution at 25 °c. Calculate the pH at equivalence. The pk of hydrocyanic acid is 9.21. Round your answer to 2 decimal places. Note for advanced students: you may assume the total volume of the solution equals the initial volume plus the volume of кOH solution added. pH = 0 1/3 Xarrow_forwardConsider the titration of 100.0 mL of 0.100 M HCN by 0.100 M KOH at 25°C. K for HCN 6.2×10-10, Part 1 Calculate the pH after 0.0 mL of KOH has been added. pH = Part 2 Calculate the pH after 50.0 mL of KOH has been added. pH = Part 3 Calculate the pH after 75.0 mL of KOH has been added. pH = Part 4 Calculate the pH at the equivalence point. pH = Part 5 Calculate the pH after 125 mL of KOH has been added. pH =arrow_forward8) The next 9 questions are related to the titration of 20.00 mL of a 0.0750 M acetic acid solution with 0.0700 M KOH. How many mL of KOH have been added at the half-equivalence point? (The half-equivalence point is reached when half the volume of the KOH needed to reach the equivalence point has been added. At this point, half of the acid will have been converted to its conjugate base.)arrow_forward
- You need to prepare 100.0 mL of a pH 4.00 buffer solution using 0.100 M benzoic acid (p?a=4.20) and 0.180 M sodium benzoate. How many milliliters of each solution should be mixed to prepare this buffer? benzoic acid: mL sodium benzoate: mLarrow_forwardDetermine the pH of the following points in a titration of 50.0mL of 0.150 M hypochlorous acid with 0.125M sodium hydroxide. The ionization constant of hypochlorous acid is 2.9 x 10-8. Write the appropriate reactions for each step. a) Before addition of sodium hydroxide b) After addition of 13.9mL of sodium hydroxide (write the reaction) c) At half the equivalence point d) At the equivalence point e) After addition of 82.0mL of sodium hydroxide f) Sketch the titration curve for this reaction.arrow_forwardBuffer capacity is a measure of a buffer solution's resistance to changes in pH as strong acid or base is added. Suppose that you have 175 mL of a buffer that is 0.460 M in both propanoic acid (C,H,COOH) and its conjugate base (C,H,CO0-). Calculate the maximum volume of 0.380 M HCl that can be added to the buffer before its buffering capacity is lost.arrow_forward
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