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Star Republic: Guide for Biologists

Common lab stock solutions and molar concentration

Name

Concentration
(w/v %)

Molecular
weight

Density
(g/ml)

Molar
concentration

Ammonium hydroxide (NH4OH)

28

35.04

0.89

7.1

Formaldehyde (CH2O)

37

30.03

1.09

12.7

Hydrochloric acid (HCl)

37

36.46

1.19

12

beta-mercaptoethanol (HSCH2CH2OH)

100

78.14

1.114

14.2

Phosphoric acid (H3PO4)

85

97.98

1.7

14.7

Sulfuric acid (H2SO4)

96

98.06

1.84

18

Nitric acid (HNO3)

71

63

1.42

16