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It measures the acidity or alkalinity of the solution, with 7 being neutral.

It does this by referring to the negative lograrithm f the molarity of the H+ ion in the solution. This a pH of 2 (acidic) means there are 10-2 moles of H+ /liter in the liquid and a pH of 10 (basic) means there are 10-10moles of H+ /liter .

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