Question

1M of a weak acid HZ with Ka = 10e-8 equilibrates in water according to the equation, HZ + H2O -> H3O+ + Z-. What's the pH of solution at equilibrium?

a. 4
b. 6
c. 2
d. 7

Answer 1

The pH of the solution at equilibrium is 0, indicating an acidic solution.

Step-by-step explanation:

In order to determine the pH of the solution, we need to calculate the hydronium ion concentration ([H3O+]).

According to the given equation, the weak acid HZ reacts with water to form H3O+ and Z-. Since 1M of the weak acid HZ with a Ka of 10e-8 equilibrates in water, the equilibrium concentration of H3O+ will be equal to the initial concentration of the weak acid, which is 1M.

Therefore, the pH of the solution at equilibrium is 0, which is acidic.