A chemistry graduate student is given 300. mL of a 1.80M benzoic acid (HC,H,CO₂) solution. Benzoic acid is a weak acid with K-6.3 x 105. What mass of NaC, H,CO₂ should the student dissolve in the HC H,CO₂ solution to turn it into a buffer with pH = 4.66? You may assume that the volume of the solution doesn't change when the NaC,H,CO₂ is dissolved in it. Be sure your answer has a unit symbol, and round it to 2 significant digits. 0 X G OL

A chemistry graduate student is given 300. mL of a 1.80M benzoic acid (HC,H,CO₂) solution. Benzoic acid is a weak acid with K-6.3 x 105. What mass of NaC, H,CO₂ should the student dissolve in the HC H,CO₂ solution to turn it into a buffer with pH = 4.66? You may assume that the volume of the solution doesn't change when the NaC,H,CO₂ is dissolved in it. Be sure your answer has a unit symbol, and round it to 2 significant digits. 0 X G OL

Principles of Modern Chemistry

8th Edition

ISBN:9781305079113

Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Chapter15: Acid–base Equilibria

Section: Chapter Questions

Problem 95AP

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Concept explainers

Acid Base Titration

An acid-base titration is the method of quantitative analysis for determining the concentration of an acid and base by exactly neutralizing it with a standard solution of base or acid having known concentration.

Question

**Calculating the Composition of a Buffer at a Given pH**

A chemistry graduate student is given 300. mL of a 1.80 M benzoic acid (\( \text{HC}_7\text{H}_5\text{CO}_2 \)) solution. Benzoic acid is a weak acid with \( K_a = 6.3 \times 10^{-5} \). What mass of \( \text{NaC}_7\text{H}_5\text{CO}_2 \) should the student dissolve in the \( \text{HC}_7\text{H}_5\text{CO}_2 \) solution to turn it into a buffer with pH = 4.66?

You may assume that the volume of the solution doesn’t change when the \( \text{NaC}_7\text{H}_5\text{CO}_2 \) is dissolved in it. Be sure your answer has a unit symbol, and round it to 2 significant digits.

- **Input Box:** [Mass] x
- **Check Button:** [Check]
- **Explanation Button:** [Explanation]

**Progress Indicator** showing completion: This is question 3 out of 5 in the current section.

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