Question

For each of the following hydroxide ion concentrations, what is the hydronium ion
concentration? The pH? The pOH? 3.5 × 10-5 M, 7.1 × 10-1 M, 4.5 × 10-10 M, 2.1 × 10-7
M

Answer 1

$[H^+][OH^-]=10^{-14}$

$[H^+]=\frac{10^{-14}}{[OH^-]}$

pH=-log[H⁺]

1) [OH^-] =$3.5\times10^{-5}$

[H⁺]=$\frac{10^{-14 }}{3.5\times10^{-5}}$=2.85$\times$10^-10

pH=-log[2.85$\times$10^-10] = 10-0.45 =9.55