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Chemistry
Which of these correctly defines the pOH of a solution? the log of the hydronium ion concentration the negative log of the hydronium ion concentration the log of the hydroxide ion concentration the negative log of the hydroxide ion concentration
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pOH measures how basic a solution is.
pOH scale can be calculated as follows
pOH = -log[OH⁻]
[OH⁻] is the hydroxide ion concentration. 
therefore pOH is the negative log of the hydroxide ion concentration. 
correct option is the 4th option.
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