Equilibrium Question 804

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−] to [CO2] would be

Options:

A) 3.8×10−13

B) 3.8×10−1

C) 6.0

D) 13.4

Show Answer

Answer:

Correct Answer: B

Solution:

CO2+2H2O→H3O++HCO3−;

Kc=[H3O+][HCO3−][CO2];

[HCO3−][CO2]=3.8×10−710−6=3.8×10−1

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