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Horvath Practice Problems 58

# Horvath Practice Problems 58 - Reaction Between a...

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Reaction Between a Polyprotic Weak Acid and a Strong Base The reaction of a weak polyprotic acid and a strong base is a little more complicated but is nonetheless similar to what we have done. Example : What is the f nal pH of a reaction between 25 ml of a 0.10 M Vitamin C (H 2 C 6 H 6 O 6 ) solution and 25 mL of a 0.20 M NaOH solution? The K a 1 =7 . 9 × 10 5 and K a 2 = 1 . 6 × 10 12 . Like above we write a balanced reaction H 2 C 6 H 6 O 6 +2 NaOH ­ Na 2 C 6 H 6 O 6 H 2 O H 2 C 6 H 6 O 6 OH ­ C 6 H 6 O 2 6 H 2 O All the NaOH reacted with the vitamin C to produce only C 6 H 6 O 2 6 . The concentration of C 6 H 6 O 2 6 is 0 . 025 LH 2 C 6 H 6 O 6 × 0 . 10 mol H 2 C 6 H 6 O 6 L × 0 . 10 mol C 6 H 6 O 2 6 0 . 10 mol H 2 C 6 H 6 O 6 =0 . 0025 mol C 6 H 6 O 2 6 The total volume after the reaction is 50 mL so, £ C 6 H 6 O 2 6 ¤ = 0 . 0025 mol C 6 H 6
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