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.
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.
Chemistry for Today: General, Organic, and Biochemistry
9th Edition
ISBN:9781305960060
Author:Spencer L. Seager, Michael R. Slabaugh, Maren S. Hansen
Publisher:Spencer L. Seager, Michael R. Slabaugh, Maren S. Hansen
Chapter16: Amines And Amides
Section: Chapter Questions
Problem 16.24E
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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
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(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](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fbd39a6aa-9f5d-4db8-b7a4-a018b8c08a69%2F3f3d6942-0ea6-4563-a0d4-bd60b4ed706b%2Fc5cpd3m_processed.png&w=3840&q=75)
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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