# Define pH scale /pH of a solution/pOH of a solution.

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Define pH scale /pH of a solution/pOH of a solution.

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pH scale is a negative logarithmic scale used to express hydronium ion concentration in molarity.

pH of a solution is defined as the negative logarithm to base ten molar concentration of hydrogen ion.

pOH of a solution is defined as the negative logarithm to base ten molar concentration of hydroxyl ion.