Acids and Alkalis

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Last updated 12:51 PM on 6/16/26
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7 Terms

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acid

A substance with a pH value lower than 7. The closer to pH 0, the more acidic a substance is

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alkali

A soluble base with a pH value higher than 7. The closer to pH 14, the more alkaline a substance is.

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base

A substance that reacts with an acid to neutralise it.

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indicator

substance that changes colour when added to acidic or alkaline solutions.

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neutralisation reaction

A reaction between an acid and a base or an acid and an alkali, forming a salt and water.

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pH

A measure of the acidity or alkalinity of a substance on a scale of 0 to 14.

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Ph scale

A scale from 0 to 14 that is used to measure the acidity or alkalinity of a substance.