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1. Determine the pH of the buffer solution that is prepared by mixing 39.6 mL of...

1. Determine the pH of the buffer solution that is prepared by mixing 39.6 mL of 0.0956 M ADA−H (C6H9N2O5− ) to 49.4 mL of 0.0302 M ADA (C6H8N2O52− ). Assume the 5% approximation is valid. Report your answer to 2 decimal places. The pKa of ADA−H is 6.84.

2. Determine the pH of the ADA−H/ADA buffer solution after the addition of 376 mL of 0.00616 M solution of sodium hydroxide to the existing buffer solution. Assume the 5% approximation is valid.

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Homework Answers

Answer #1

millimoles of salt = 49.4 x 0.0302 = 1.492

millimoles of acid = 39.6 x 0.0956 = 3.786

pH = pKa + log [salt/acid]

      = 6.84 + log [1.492 / 3.786]

       = 6.44

pH = 6.44

2)

on addition of ’ C’ moles of base to acidic buffer salt moles increases and acid moles decreases

so

C = 376 x 0.00616 = 2.316

pH = pKa + log [Salt +C/acid - C]

      = 6.84 + log [1.492 + 2.316 / 3.786 - 2.316]

      = 7.25

pH = 7.25

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