Question

B. PART B: Preparation of a buffer by mixing solutions of a weak acid and conjugated base A student performed PART B of the Buffer lab. After preparing Phosphate Buffers A, B and C, the student measured the pH of each of the buffers using a pH meter. The pH measurements for the 3 phosphate buffers are recorded in the table below. Consider the phosphate buffers the student made by mixing solutions of Sodium phosphate monobasic (NaH2PO4) and Sodium phosphate dibasic (Na2HPO4) and answer the questions below. 1. Fill out the remaining information in the table below (9pts): PART B: Preparation of a Buffer by mixing solutions of a weak acid and conjugated base | Phosphate Buffer A | Phosphate Buffer B | Phosphate Buffer C --- | --- | --- | --- Volume of 0.1M Sodium Phosphate Monobasic | 25ml | 5ml | 50ml Volume of 0.1M Sodium Phosphate Dibasic | 25ml | 50ml | 5ml Ratio of -A/HA | 1:1 | 1:10 | 10:1 pH of the buffer (measured) | 7.23 | 8.20 | 6.19 2. State the equilibrium, Ka and pKa for the Phosphate buffer system the student made. Which phosphate species are at equilibrium? Which phosphate specie acts as an acid? Which one acts as a conjugated base? (6pts)

          B. PART B: Preparation of a buffer by mixing solutions of a weak acid and conjugated base
A student performed PART B of the Buffer lab. After preparing Phosphate Buffers A, B and C, the student measured the pH of each of the buffers using a pH meter. The pH measurements for the 3 phosphate buffers are recorded in the table below. Consider the phosphate buffers the student made by mixing solutions of Sodium phosphate monobasic (NaH2PO4) and Sodium phosphate dibasic (Na2HPO4) and answer the questions below.

1. Fill out the remaining information in the table below (9pts):

PART B: Preparation of a Buffer by mixing solutions of a weak acid and conjugated base | Phosphate Buffer A | Phosphate Buffer B | Phosphate Buffer C
--- | --- | --- | ---
Volume of 0.1M Sodium Phosphate Monobasic | 25ml | 5ml | 50ml
Volume of 0.1M Sodium Phosphate Dibasic | 25ml | 50ml | 5ml
Ratio of -A/HA | 1:1 | 1:10 | 10:1
pH of the buffer (measured) | 7.23 | 8.20 | 6.19

2. State the equilibrium, Ka and pKa for the Phosphate buffer system the student made. Which phosphate species are at equilibrium? Which phosphate specie acts as an acid? Which one acts as a conjugated base? (6pts)

B. PART B: Preparation of a buffer by mixing solutions of a weak acid and conjugated base
A student performed PART B of the Buffer lab. After preparing Phosphate Buffers A, B and C, the student measured the pH of each of the buffers using a pH meter. The pH measurements for the 3 phosphate buffers are recorded in the table below. Consider the phosphate buffers the student made by mixing solutions of Sodium phosphate monobasic (NaH2PO4) and Sodium phosphate dibasic (Na2HPO4) and answer the questions below.

1. Fill out the remaining information in the table below (9pts):

PART B: Preparation of a Buffer by mixing solutions of a weak acid and conjugated base | Phosphate Buffer A | Phosphate Buffer B | Phosphate Buffer C
— | — | — | —
Volume of 0.1M Sodium Phosphate Monobasic | 25ml | 5ml | 50ml
Volume of 0.1M Sodium Phosphate Dibasic | 25ml | 50ml | 5ml
Ratio of -A/HA | 1:1 | 1:10 | 10:1
pH of the buffer (measured) | 7.23 | 8.20 | 6.19

2. State the equilibrium, Ka and pKa for the Phosphate buffer system the student made. Which phosphate species are at equilibrium? Which phosphate specie acts as an acid? Which one acts as a conjugated base? (6pts)

Added by David C.

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