What does the pH scale measure?

The pH scale measures the acidity or alkalinity of a solution on a scale from 0 to 14.

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What is the pH of a neutral substance?

pH 7 is neutral.

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What is the pH range for acidic substances?

Substances with a pH between 1-6 are acidic.

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What is the pH range for alkaline substances?

Substances with a pH between 8-14 are alkaline.

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What are indicators?

Indicators are special dyes that change color depending on the pH.

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What happens when blue litmus paper is put in acids?

Blue litmus paper turns red in acids.

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What happens when red litmus paper is put in alkalis?

Red litmus paper turns blue in alkalis.

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How does the pH scale indicate the strength of acids and alkalis?

The lower the pH, the stronger the acid. The higher the pH, the stronger the alkali.

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