What is the `[H^(+)]` in 0.40 M solution of , HOCl , `K_a = 3.5xx10^(-8)` ?

Hclo is a weak acid. What is the concentration of H^+ ions in 0.1 solution of Hclo '(K_a = 5 xx 10^-8) ?

What concentartion of Ac^(-) ions will reduce H_(3)O^(+) ion to 2 xx 10^(-4) M in 0.40 M solution of HAc ? [K_(a) (HAc) = 1.8 xx 10^(-5)] Given your answer after multiplying by 1000.

Calculate the concentration of H^+ ions in 0.2 M solution of CH_3COOH . K_a for CH_3COOH=1.8xx10^(-5)

What is the pH of a 0.20 M HA solution (K_a=1.0xx10^(-6)) that contains 0.40 M NaA ?

What is the pH of the following solutions: a. 10^(-8)M HCl b. 5 xx 10^(-8) M HCl c. 5xx10^(-10)M HCl d. 10^(-3) M HCl