Design a buffer that has a pH of 9.74 using one of the weak acid/conjugate base systems shown below. Weak Acid Conjugate Base Ka pka HC204 C2042- 6.4 x 10-5 4.19 H2PO4 HPO42- 6.2 x 10-8 7.21 HCO3 co;?- 4.8 x 10-11 10.32 How many grams of the potassium salt of the weak acid must be combined with how many grams of the potassium salt of its conjugate base, to produce 1.00 L of a buffer that is 1.00 M in the weak base? grams potassium salt of weak acid = grams potassium salt of conjugate base =

Design a buffer that has a pH of 9.74 using one of the weak acid/conjugate base systems shown below. Weak Acid Conjugate Base Ka pka HC204 C2042- 6.4 x 10-5 4.19 H2PO4 HPO42- 6.2 x 10-8 7.21 HCO3 co;?- 4.8 x 10-11 10.32 How many grams of the potassium salt of the weak acid must be combined with how many grams of the potassium salt of its conjugate base, to produce 1.00 L of a buffer that is 1.00 M in the weak base? grams potassium salt of weak acid = grams potassium salt of conjugate base =

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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A buffer is created by mixing 600 mL solution of acid HA (0.500 M) with 700 mL of conjugate base A- (0.800M). acid HA has the acid dissociation constant of 9.20 x 10-5 Determine the pH of the mixture
Design a buffer that has a pH of 6.70 using one of the weak acid/conjugate base systems shown below. Weak Acid Conjugate Base Ką pKa HC,04 C,0,²- 6.4 x 10-5 4.19 H,PO4 HPO,2- 6.2 x 10-8 7.21 HCO3 co,?- 4.8 × 10-11| 10.32 How many grams of the potassium salt of the weak acid must be combined with how many grams of the potassium salt of its conjugate base, to produce 1.00 L of a buffer that is 1.00 M in the weak base? grams potassium salt of weak acid = grams potassium salt of conjugate base =
Which of the following would destroy a buffer containing 0.134 moles of weak acid HA and 0.268 moles of conjugate base A -? 0.134 mol of HCl 0.186 mol of HCl 0.0670 mol of NaOH 0.0447 mol of NaOH 0.268 mol of HCl
Find the ph of a buffer solution that is made by mixing 30ml of 1M NaA and 30ml of 1M HA. Find the ph when 2ml of 1M HCl is added to 30ml of this buffer solution. Given (Ka = 2.11*10^-5)
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Calculate change in pH of a buffer solution
Which of the following is not a characteristic of buffer solutions? O They cannot be tailored to maintain a specified pH. O They contain a conjugate base of a weak acid. O They contain a weak acid. O They have a finite capacity for accommodating added acid or base. O They can maintaln their pH, even when small amounts of acid or base are added. QUESTION 10 The capacity of a buffer solution is greater when there are large amounts of a weak acid and its conjugate base in solution. O True O False
4. What is the pH of a buffer made from 0.42 M H3BO3 and 0.22 M H2BO3-, if the Ka for H3BO3 is 7.3 x 10-10 ? (use 2 decimal places for pH)
for each of the five solutions calculate the equilibrium [H+] from the measured pH and determine the Kavalue. 1. pH = 2.34 // derived form 30.0 mL sample of 1.0 M HOAc 2. pH = 3.21 // derived form 30.0 mL sample of 0.1 M HOAc 3. pH = 4.88 // derived from adding 24.0 mL of 1.0 M NaOAc to 10.0 mL of 1.0 M HOAc 4. pH = 4.99 // derived from diluting 10 mL of solution 3 with 40.0 mL deionized water 5. pH = 9.33 // derived form 30.0 mL sample of 1.0 M NaOAc
Assuming equal concentrations of conjugate base and acid, which one of the following mixtures is the best choice for making a buffer solution with an optimum pH in the range of 3.1-3.5? O O O NaNO2/HNO2 (K₂ = 4.6 x 10-4) KCH3COO/CH3COOH (K₂ = 1.75 x 10-5) CH3NH2/CH3NH3CI (K₂ = 2.3 x 10-11) NaOCN/HOCN (K₂ = 2.0 x 10-4) NaNO3/HNO3 20