Q35.A student needs to prepare a buffer solution of propanoic acid and its sodium salt with pH 4. The ratio of [CH3 CH2 COO−] required to make buffer is Given : Ka(CH3 CH2 COOH) = 1. 3 × 10−5 [CH3 CH2 COOH] (1) 0. 03 (2) 0. 13 (3) 0. 23 (4) 0. 33
What This Question Tests
This question applies the Henderson-Hasselbalch equation to calculate the required ratio of conjugate base to weak acid for a given pH and acid dissociation constant.
Concepts Tested
Formulas Used
pH = pKa + log([Salt]/[Acid])
pKa = -log(Ka)
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📋 Question Details
- Chapter
- Ionic Equilibrium
- Topic
- Buffer solutions
- Year
- 2022
- Shift
- 28 Jun Shift 2
- Q Number
- Q35
- Type
- MCQ
- NCERT Ref
- Class 11 Chemistry Ch 7: Equilibrium
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