Sodium benzoate, NaC6H5COO (molar mass 144.1 g mol-1) is a common food preservative. The Ka of benzoic acid, C6H5COOH, is 1.6 X 10-5. A chemist titrates 25.00 mL of a stock solution of sodium benzoate, NaC6H5COO, with 1.20 M HCl solution using a pH meter and an indicator (d)  Calculate the pH at the half-equivalence point.

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Sodium benzoate, NaC6H5COO (molar mass 144.1 g mol-1) is a common food preservative. The Ka of benzoic acid, C6H5COOH, is 1.6 X 10-5.

A chemist titrates 25.00 mL of a stock solution of sodium benzoate, NaC6H5COO, with 1.20 M HCl solution using a pH meter and an indicator

  1. (d)  Calculate the pH at the half-equivalence point.

Indicator
pK.
Phenolphthalein
Bromothymol blue
Methyl red
Thymol blue
9.3
7.0
5.0
2.0
Methyl violet
0.80
Transcribed Image Text:Indicator pK. Phenolphthalein Bromothymol blue Methyl red Thymol blue 9.3 7.0 5.0 2.0 Methyl violet 0.80
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