Question

1. A buffer solution contains 0.476 M KH2PO4 and 0.202 M Na2HPO4. Determine the pH change...

1. A buffer solution contains 0.476 M KH2PO4 and 0.202 M Na2HPO4. Determine the pH change when 0.050 mol HClO4 is added to 1.00 L of the buffer.

pH change = ______

2. Determine the pH change when 0.077 mol HClO4 is added to 1.00 L of a buffer solution that is 0.331 M in CH3COOH and 0.304 M in CH3COO-.

pH after addition − pH before addition = pH change =_____

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Answer #1

1)

A buffer solution contains 0.476 M KH2PO4 and 0.202 M Na2HPO4. Determine the pH change when 0.050 mol HClO4 is added to 1.00 L of the buffer.

pKa of H2PO4- = 7.21

pH = pKa + log [Na2HPO4 / KH2PO4]

    = 7.21 + log [0.202 / 0.476]

   = 6.84

initial pH = 6.84

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

     = 7.21 + log [0.202 - 0.05 / 0.476 + 0.05]

    = 6.67

final pH = 6.67

pH change = 6.67 - 6.84 = -0.17

pH change = - 0.17

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