A 1.00 liter solution contains 0.53 M hypochlorous acid and 0.40 M potassium hypochlorite.

Question

If 35.0 mL of water are added to this system, indicate whether the following statements are true or false.

(Note the the volume MUST CHANGE upon the addition of water.)

A. The concentration of HClO will remain the same.

B. The concentration of ClO^- will remain the same.

C. The equilibrium concentration of H₃O⁺ will decrease.

D. The pH will remain the same.

E. The ratio of [HClO] / [ClO^-] will remain the same.

Answer 1

A. The concentration of HClO will remain the same. False. The [HClO] will decrease upon dilution.

B. The concentration of ClO^- will remain the same. False. The [ClO^-] will decrease upon dilution.

C. The equilibrium concentration of H₃O⁺ will decrease. False. The [H₃O⁺] will decrease upon dilution.

D. The pH will remain the same. False. The pH will increase if the [H₃O⁺] decreased.

E. The ratio of [HClO] / [ClO^-] will remain the same. True. Both HClO and ClO- will be diluted by the same factor so the ratio will remain the same.