Be sure to answer all parts. Calculate the pH of 1.00 L of the buffer 0.91 M CH

Question

Be sure to answer all parts.

Calculate the pH of 1.00 L of the buffer 0.91 M CH3COONa/1.06 M CH3COOH before and after the addition of the following species. (Assume there is no change in volume.)

(a) pH of starting buffer:



(b) pH after addition of 0.040 mol NaOH:



(c) pH after further addition of 0.126 mol HCl:
Be sure to answer all parts.

Calculate the pH of 1.00 L of the buffer 0.91 M CH3COONa/1.06 M CH3COOH before and after the addition of the following species. (Assume there is no change in volume.)

(a) pH of starting buffer:



(b) pH after addition of 0.040 mol NaOH:



(c) pH after further addition of 0.126 mol HCl:

Explanation / Answer

(a) pH of starting buffer:

pH = pKa + log [CH3COONa / CH3COOH]

pH = 4.74 + log (0.91 / 1.06)

pH = 4.67

(b) pH after addition of 0.040 mol NaOH

C = 0.040

pH = pKa + log [CH3COONa + C / CH3COOH -C]

pH = 4.74 + log (0.91 +0.040 / 1.06-0.040)

pH = 4.71

(c) pH after further addition of 0.126 mol HCl:

pH = pKa + log [CH3COONa - C / CH3COOH + C]

pH = 4.74 + log (0.91 -0.040 / 1.06 + 0.040)

pH = 4.64

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