Question
What is the concentration of hydrogen ion in the solution when the concentration of hydroxyl ion is 0.08 mol / dm^3 at 298 K ?
MHT CET
Chemistry
Ionic Equilibrium
2026
MHT CET 2026 (13 April Shift 2)
MHT CET Chemistry Question (2026) — Solution
Options
- A. 0.125 mol/L
- B. 0.125 10^ -12 mol/L
- C. 0.0125 mol/L
- D. 0.125 10^ -10 mol/L
Answer
B. 0.125 10^ -12 mol/L
Step-by-step solution
At 298 K, the ionic product of water is K_w = [H^+][OH^-] = 1.0 10^ -14 . Given [OH^-] = 0.08 mol/dm^3 = 0.08 mol/L. [H^+] = K_w [OH^-] = 1.0 10^ -14 0.08 [H^+] = 1 8 10^ -12 = 0.125 10^ -12 mol/L. Answer: 0.125 10^ -12 mol/L
Related: Chemistry — Ionic Equilibrium · All PYQ Banks