Measuring pH
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17 Terms
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pH Strong acids
0-2
2
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pH Weak acids
3-6
3
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pH Strong alkalis
12-14
4
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pH
A measure of H+ concentration
5
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pH Weak Alkali
8-10
6
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Neutral pH
7
7
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pH of acids
less than 7
8
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pH of alkalis
more than 7
9
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Universal indicator
An indicator with a different colour for each pH value
10
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If pH decreases by 1
hydrogen ion concentration increases x10
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At pH 7
concentration of H+ = concentration of OH-
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Strong acid
An acid that ionises completely in water
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Weak acid
An acid that only partially ionises in water
14
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Phenolphthalein
Indicator which is clear in acidic solution and pink in basic solution.
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Litmus
Indicator that turns red in acid and blue in base
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Methyl orange
Indicator that is red in acid, yellow in alkali
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pH probe
An instrument which measures pH to 1 decimal place