pH after addition of pH after addition of Immol of 20mmol of Me Me ml- 100 100.
ID: 555770 • Letter: P
Question
pH after addition of pH after addition of Immol of 20mmol of Me Me ml- 100 100. | 3.85 3.84.1 3.86-| 3.67-| 4,03 6 1.00- 1.00 7 0.10100 0.10 100-1385| 3.7 3.94-1 1.30-1 12.7 pH after addition Solution Me ml- M- ml HCI NaOH 0.90- 0.70- 0.50- 0.30 0.10- 1. How do different relative concentrations of buffer components affect a) the pH of a buffer 0.10- 0.30- 0.50- 0.70- 0.90- 100 100 100- 100- 100 100 100. 100- 100 100- 4.80 4.22 12.70- 4.22 3.854.80 3.85 3.48 4.22 3.48 2.913.85 2.90129 348- 1- 2- and b) the buffer capacity? Explain using your results. 2. How do different absolute concentrations of buffer components affect a) the pH of a buffer and b) the buffer capacity? Explain using your results.Explanation / Answer
Buffer solutions
1. The different relative concentrations of buffer components affect,
a) the pH of buffer : As the concentration of conjugate base in the system goes up, the pH also increases accordingly. Whereas, as the concentration of the weak acid increases in the buffer the pH decreases rapaidly.
b) buffer capacity : As the relative concentration of weak acid and the conjugate base becomes equal, the pH of the solution reaches its pKa value. The solution thus have highest buffer capacity. The buffer capacity decreases with increasing difference between the concentration of weak acid and its conjugate base presen tin the solution.
2. Absolute concentration of buffer components affect,
a) pH of a buffer : As the concentration of components the weak acid and the conjugate base fluctuates with respect to the unity value for [conjugate base/weak acid], the pH of the buffer may go up when basic factor is greater than acid or becomes lower when acid decreases.
b) buffer capacity : deviation from pKa value causes a change in the buffer capacity of the system. The buffer capacity is maintained well at low concentrations, whereas, it reaches a minimum value with higher concentration of conjugate base or the acid, one at a time.
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