What is the concentration of hydroxide in a solution with a pOH of 9.8?
ph+pOH=14 [OH-]=10^-pOH

1.6 x 10⁻¹⁰ M

Explanation:

The question already gives pOH, so you do not have to subtract from 14, as you would have to do if they gave you pH.

[OH-]=10^-pOH = 10⁻⁹.⁸  = 1.6 x 10⁻¹⁰ M

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