Environmental Engineering Problems and Solutions

Appendix 2: Molecular and Equivalent Weights

Name

Formula

Molecular Weight

Equivalent Weight

Aluminum Sulfate

Al 2(SO 4) 3 18H 2O

666.4

111.0

Aluminum Sulfate

Al 2(SO 4) 3

342.1

57.0

Aluminum Hydroxide

Al(OH) 3

78.0

26.0

Bicarbonate

HCO 3 ?

61.0

61.0

Calcium

Ca

40.1

20.0

Calcium Bicarbonate

Ca(HCO 3) 2

162.1

81.0

Calcium Carbonate

CaCO 3

100.0

50.0

Calcium Hydroxide

Ca(OH) 2

74.1

37.0

Calcium Oxide

CaO

56.1

28.0

Calcium Sulfate

CaSO 4

136.2

68.1

Carbon Dioxide

CO 2

44.0

22.0

Ferrous Sulfate

FeSO 4 7H 2O

278.0

139.0

Ferric Chloride

FeCl 3

162.2

54.1

Ferric Sulfate

Fe 2(SO 4) 3

400.0

66.7

Hydrogen Sulfide

H 2S

34.1

17.0

Hydrochloric Acid

HCl

36.5

36.5

Magnesium

Mg

40.3

20.1

Nitric Acid

HNO 3

63.0

63.0

Sodium

Na

23.0

23.0

Sodium Bicarbonate

NaHCO 3

84.0

84.0

Sodium Carbonate

Na 2CO 3

106.0

53.0

Sodium Hydroxide

NaOH

40.0

40.0

Sulfuric Acid

H 2SO 4

98.1

49.0

Sulfate

SO 4 ?2

96.0

48.0

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