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