Definition and determination of pH (3.1.12.2)

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Last updated 2:45 PM on 8/24/26

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What is pH?

pH is a measure of acidity and alkalinity. It is a logarithmic scale, measuring the concentration of H⁺ ions in an aqueous solution

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What are the equations for pH?

pH = - log[H⁺]

[H⁺] = 10^-pH

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How many decimal places should you give pH to?

Give pH to 2 decimal places

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How do you work out [H⁺]?

To work out the concentration of H⁺ find the concentration of the acid. If it's diprotic multiply that concentration by two.