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© Boardworks Ltd 2003 Indicators: the pH scale This attaches a number called the pH value to each universal indicator colour. This means we can quickly.

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Presentation on theme: "© Boardworks Ltd 2003 Indicators: the pH scale This attaches a number called the pH value to each universal indicator colour. This means we can quickly."— Presentation transcript:

1 © Boardworks Ltd 2003 Indicators: the pH scale This attaches a number called the pH value to each universal indicator colour. This means we can quickly say how acid or alkali a substance is by quoting a single number. 12141312111098 7 6543 Strong acid NeutralStrong alkali Weak acidWeak alkali pH7 is neutral pH 1 is strongly acid pH14 is strongly alkali

2 © Boardworks Ltd 2003 Indicators: the pH scale

3 © Boardworks Ltd 2003 Will it be acidic, basic or neutral and how strong? 12141312111098 7 6543 SubstancepHDescription of acid / alkali Soda water6 Car battery acid1 Soap8 Washing soda10 Stomach acid2 Oven cleaner14 Vinegar4 very weak acid very strong acid very weak alkali weak alkali strong acid very strong alkali weak acid AlkaliAcid Indicators: the pH scale


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