When we talk about pH we are referring to the concentration of hydronium ions present. If the concentration of hydronium in a solution is 1.0 x 10^-8 M, what is the hydroxide ion concentration?

Question

Quizplus · Accepted Answer

The pH and pOH of a solution are related through the equation $pH + pOH = 14$. Given the concentration of hydronium ions ($H_3O^+$) is $1.0 \times 10^{-8} M$, the pH is 8. To find the pOH, we subtract the pH from 14, giving us 6. The concentration of hydroxide ions ($OH^-$) can then be found using the formula $pOH = -\log[OH^-]$, which gives us $OH^- = 1.0 \times 10^{-6} M$.

When We Talk About PH We Are Referring to the Concentration