Question

Solve for the hydronium ion concentration of a solution with a pOH of 6.43

Answer 1

$from, pH + pOH = 14\\ \begin{aligned} \\ pH &= 14 - pOH\\ pH &= 14 - 6.43\\ pH &= 7.57 \end{aligned}$

$\begin{aligned} \textsf{from, }pH &= -log[H_3O^+]\\ \\ 7.57 &= -log[H_3O^+]\\ -7.57 &= log[H_3O^+]\\ 10^{-7.57} &= [H_3O^+]\\ [H_3O^+] &= 2.69 × 10^{-8}M \end{aligned}$