pH is a measure of the activity of
hydrogen ions (H+) in a solution and, therefore, its acidity or
alkalinity.
Acidity of some common acids are
indicated in the table below :
Acid
|
Normality
|
pH
|
Acetic
|
N
|
2.4
|
Acetic
|
0.1 N
|
2.9
|
Acetic
|
0.01 N
|
3.4
|
Alum
|
0.1 N
|
3.2
|
Arsenious
|
saturated
|
5.0
|
Benzoic
|
0.1 N
|
3.0
|
Boric
|
0.1 N
|
5.2
|
Carbonic
|
saturated
|
3.8
|
Citric
|
0.1 N
|
2.2
|
Formic
|
0.1 N
|
2.3
|
Hydrochloric
|
N
|
0.1
|
Hydrochloric
|
0.1 N
|
1.1
|
Hydrochloric
|
0.01 N
|
2.0
|
Hydrocyanic
|
0.1 N
|
5.1
|
Hydrogen sulfide
|
0.1 N
|
4.1
|
Lactic
|
0.1 N
|
2.4
|
Lemon Juice
|
2
|
|
Malic
|
0.1 N
|
2.2
|
Nitric
|
0.1N
|
1.0
|
Orthophosphoric
|
0.1 N
|
1.5
|
Oxalic
|
0.1 N
|
1.3
|
Salicylic
|
saturated
|
2.4
|
Succinic
|
0.1N
|
2.7
|
Sulfuric
|
N
|
0.3
|
Sulfuric
|
0.1 N
|
1.2
|
Sulfuric
|
0.01 N
|
2.1
|
Sulfurous
|
0.1 N
|
1.5
|
Stomach Acid
|
1
|
|
Tartaric
|
0.1 N
|
2.2
|
Trichloracetic
|
0.1N
|
1.2
|
Vinegar
|
3
|
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