Question
Calculate the pH of buffer solution containing 0.1M CH _3 COOH and 0.1 M CH _3 COONa [K_a = 1.8 10^ -5 ]
MHT CET
Chemistry
Ionic Equilibrium
2026
MHT CET 2026 (20 April Shift 2)
MHT CET Chemistry Question (2026) — Solution
Options
- A. 4.745
- B. 5.741
- C. 2.876
- D. 7.001
Answer
A. 4.745
Step-by-step solution
Using the Henderson-Hasselbalch equation for an acidic buffer: pH = p K_a + ( [ Salt ] [ Acid ] ) Given [ Salt ] = 0.1 M and [ Acid ] = 0.1 M pH = - (1.8 10^ -5 ) + ( 0.1 0.1 ) pH = 5 - (1.8) + (1) pH = 5 - 0.255 + 0 = 4.745 Answer: 4.745
Related: Chemistry — Ionic Equilibrium · All PYQ Banks