3.00 L of a KOH solution has a poH of 1.15.
Calculate the hydroxide ion concentration.

[OH-] = 0,071 mol/L

Explanation:

pOH = -log[OH-]

[OH-] = 10^-pOH = 10^-1.15 = 0,071 mol/L

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yes the answer is total mass in unchanged   : )