QUESTION 9 The following reagents are available in the laboratory: 0.1M H3PO4; 0.1 M CH3COOH, 0.1M CH3COONa, 0.1M NaH₂PO4, 0.1M Na2HPO4, 0.1M Na3PO4, 0.1M NaOH, 0.1M HCI Choose from the following buffer: Primary phosphate, pKa = 2.30 Secondary phosphate, pKa = 7.20 Tertiary phosphate, pka = 12.10 Acetate, pKa = 4.76 Tris, pKa = 8.08 To prepare a 800 mL, 0.1M buffer solution, pH 7.4. What is the volume in mL of salt?

QUESTION 9 The following reagents are available in the laboratory: 0.1M H3PO4; 0.1 M CH3COOH, 0.1M CH3COONa, 0.1M NaH₂PO4, 0.1M Na2HPO4, 0.1M Na3PO4, 0.1M NaOH, 0.1M HCI Choose from the following buffer: Primary phosphate, pKa = 2.30 Secondary phosphate, pKa = 7.20 Tertiary phosphate, pka = 12.10 Acetate, pKa = 4.76 Tris, pKa = 8.08 To prepare a 800 mL, 0.1M buffer solution, pH 7.4. What is the volume in mL of salt?

Chemistry: An Atoms First Approach

2nd Edition

ISBN:9781305079243

Author:Steven S. Zumdahl, Susan A. Zumdahl

Publisher:Steven S. Zumdahl, Susan A. Zumdahl

Chapter14: Acid- Base Equilibria

Section: Chapter Questions

Problem 109CP: A buffer is made using 45.0 mL of 0.750 M HC3H5O2 (Ka = 1.3 105) and 55.0 mL of 0.700 M NaC3H5O2....

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Lactic acid (CH3CHOHCO2H) is found in sour milk, in sauerkraut, and in muscles after activity. (Ka for lactic acid = 1.4 104.) (a) If 2.75 g of NaCH3CHOHCO2, sodium lactate, is added to 5.00 102 mL of 0.100 M lactic acid, what is the pH of the resulting buffer solution? (b) Is the pH of the buffered solution lower or higher than the pH of the lactic acid solution?
A buffer is made using 45.0 mL of 0.750 M HC3H5O2 (Ka = 1.3 105) and 55.0 mL of 0.700 M NaC3H5O2. What volume of 0.10 M NaOH must be added to change the pH of the original buffer solution by 2.5%?
What are the [H3O+] and the pH of a propanoic acid– propanoate buffer that consists of 0.35 M CH3CH2COONa and 0.15 M CH3CH2COOH (Ka of propanoic acid = 1.3 x 10-5)?
What is the effective pH range of buffers formed with the following acids? Hint for b notice you are given a pKbnot a pKa. Propanoic acid pKa = 4.87 dimethylamine pKb = 3.23
QUESTION 4 The following reagents are available in the laboratory: 0.1M H3PO4; 0.1 M CH3COOH, 0.1M CH3COONa, 0.1M NaH2PO4, 0.1M Na2HPO4, 0.1M Na3PO4, 0.1M NaOH, 0.1M HCI Choose from the following buffer: Primary phosphate, pKa = 2.30 Secondary phosphate, pKa = 7.20 Tertiary phosphate, pKa = 12.10 Acetate, pKa = 4.76 Tris, pKa = 8.08 To prepare a 600 mL, 0.1M buffer solution, pH 5.5. What is the actual number of moles of salt needed?
QUESTION 5 The following reagents are available in the laboratory: 0.1M H3PO4; 0.1 M CH3COOH, 0.1M CH3COONa, 0.1M NaH2PO4, 0.1M Na2HPO4, 0.1M Na3PO4, 0.1M NaOH, 0.1M HCI Choose from the following buffer: Primary phosphate, pKa = 2.30 Secondary phosphate, pKa = 7.20 Tertiary phosphate, pKa = 12.10 Acetate, pKa = 4.76 Tris, pKa = 8.08 To prepare a 600 mL, 0.1M buffer solution, pH 5.5. What is the actual number of moles of acid needed?
What is the pOH of a buffer solution that is 0.150 M chloroacetic acid and 0.250 M sodium chloroacetate, after the addition of 0.100 M HNO3? The value of Ka for chloroacetic acid is 1.3 x 10-3.
QUESTION 6 The following reagents are available in the laboratory: 0.1M H3PO4; 0.1 M CH3COOH, 0.1M CH3COONa, 0.1M NaH₂PO4, 0.1M Na2HPO4, 0.1M Na3PO4, 0.1M NaOH, 0.1M HCI Choose from the following buffer: Primary phosphate, pKa = 2.30 Secondary phosphate, pKa = 7.20 Tertiary phosphate, pka = 12.10 Acetate, pKa = 4.76 Tris, pKa = 8.08 To prepare a 600 mL, 0.1M buffer solution, pH 5.5. What is the volume in mL of salt?
QUESTION 2 The following reagents are available in the laboratory: 0.1M H3PO4; 0.1 M CH3COOH, 0.1M CH3COONa, 0.1M NaH₂PO4, 0.1M Na2HPO4, 0.1M Na3PO4, 0.1M NaOH, 0.1M HCI Choose from the following buffer: Primary phosphate, pKa = 2.30 Secondary phosphate, pKa = 7.20 Tertiary phosphate, pKa = 12.10 Acetate, pka = 4.76 Tris, pKa = 8.08 To prepare a 600 mL, 0.1M buffer solution, pH 5.5. What is the theoretical total number of moles of the components?
QUESTION 8 The following reagents are available in the laboratory: 0.1M H3PO4; 0.1 M CH3COOH, 0.1M CH3COONa, 0.1M NaH₂PO4, 0.1M Na2HPO4, 0.1M Na3PO4, 0.1M NaOH, 0.1M HCI Choose from the following buffer: Primary phosphate, pKa = 2.30 Secondary phosphate, pKa = 7.20 Tertiary phosphate, pKa = 12.10 Acetate, pKa = 4.76 Tris, pka = 8.08 To prepare a 800 mL, 0.1M buffer solution, pH 7.4. What is the volume in mL of acid?
QUESTION 3 The following reagents are available in the laboratory: 0.1M H3PO4; 0.1 M CH3COOH, 0.1M CH3COONa, 0.1M NaH₂PO4, 0.1M Na2HPO4, 0.1M Na3PO4, 0.1M NaOH, 0.1M HCI Choose from the following buffer: Primary phosphate, pKa = 2.30 Secondary phosphate, pKa = 7.20 Tertiary phosphate, pKa = 12.10 Acetate, pKa = 4.76 Tris, pKa = 8.08 To prepare a 600 mL, 0.1M buffer solution, pH 5.5. What is the actual total number of moles of the components?
If you are going to prepare 100 ml each of the following two (2) buffers: • Buffer 1 will have a concentration of 0.2 M and a pH of 4.4 • Buffer 2 will have a concentration of 0.15 M and a pH of 8.9The buffering systems available to you are • dihydrogen phosphate/ hydrogen phosphate pKa= 6.8 • Tris-HCl/ Tris base pKa = 8.1 • acetic acid/ acetate pKa =4.8 What buffering system would you use for buffer 1 and buffer 2? why?