JEE Main Chemistry question
When CO₂ dissolves in water, the following equilibrium is established, CO₂+2H₂O⇌H₃O⁺+HCO₃⁻, for which the equilibrium constant is 3.8×10⁻⁷ and pH=6.0. The ratio of [HCO₃⁻]/[CO₂] is:
Answer: (B)
Solution
[H₃O⁺]=10⁻⁶. Ratio=Kc/[H₃O⁺]=3.8×10⁻⁷/10⁻⁶=0.38.