Question
The molar conductivity of 0.01 M monobasic acid at 25\,^ C is 15 ohm^ -1 cm^2 mol^ -1 . The molar conductivity of the same acid at infinite dilution is 375 ohm^ -1 cm^2 mol^ -1 . Calculate [ H ^+] in solution.
MHT CET
Chemistry
Electrochemistry
2026
MHT CET 2026 (15 April Shift 1)
MHT CET Chemistry Question (2026) — Solution
Options
- A. 2.0 10^ -4 M
- B. 3.0 10^ -4 M
- C. 4.0 10^ -4 M
- D. 5.0 10^ -4 M
Answer
C. 4.0 10^ -4 M
Step-by-step solution
The degree of dissociation is given by the ratio of molar conductivity at a given concentration to the molar conductivity at infinite dilution. = _m _m^ Substituting the given values: = 15 375 = 0.04 For a weak monobasic acid, the concentration of hydrogen ions is given by: [ H ^+] = C Substituting C = 0.01 M and = 0.04: [ H ^+] = 0.01 0.04 = 4.0 10^ -4 M Answer: 4.0 10^ -4 M
Related: Chemistry — Electrochemistry · All PYQ Banks