Formula

Number of equivalents

Equivalent Weight

POSITIVE IONS

Aluminum

Al+3

3

9.0

Ammonium

NH4+

1

18.0

Calcium

Ca2+

2

20.0

Copper

Cu2+

2

31.8

Hydrogen

H+

1

1.0

Ferrous Ion

Fe2+

2

27.9

Ferric Ion

Fe3+

3

18.6

Magnesium

Mg2+

2

12.2

Manganese

Mn2+

2

27.5

Potassium

K+

1

39.1

Sodium

Na+

1

23.0

NEGATIVE IONS

Bicarbonate

HCO3-

1

61.0

Carbonate

CO32-

2

30.0

Chloride

Cl-

1

35.5

Fluoride

F-

1

19.0

Iodide

I-

1

126.9

Hydroxide

OH-

1

17.0

Nitrate

NO3-

1

62.0

Phosphate (tribasic)

PO43-

3

31.7

Phosphate (dibasic)

HPO42-

2

48.0

Phosphate (monobasic)

H2PO4-

1

97.0

Sulfate

SO42-

2

48.0

Bisulfate

HSO4-

1

97.1

Sulfite

SO32-

2

40.0

Bisulfite

HSO3-

1

81.1

Sulfide

S2-

2

16.0

COMPOUNDS

Alum

Al2(SO4)3 18H2O

6

111.0

Aluminum Sulfate (anhydrous)

Al2(SO4)3

6

57.0

Aluminum Hydroxide

AI(OH)3

3

26.0

Aluminum Oxide

Al2O3

6

17.0

Ammonia

NH3

1

17.0

Sodium Aluminate

Na2AI2O4

6

27.3

Calcium Bicarbonate

Ca(HCO3)2

2

81.1

Calcium Carbonate

CaCO3

2

50.0

Calcium Chloride

CaCl2

2

55.5

Calcium Hydroxide

Ca(OH)2

2

37.0

Calcium Oxide

CaO

2

28.0

Calcium Sulfate (anhydrous)

CaSO4

2

68.1

Calcium Sulfate (gypsum)

CaSO4 2H2O

2

86.1

Calcium Phosphate

Ca3(PO4)2

6

51.7

Carbon Dioxide

CO2

2

22.0

Chlorine

Cl2

2

35.5

Ferrous Sulfate (anhydrous)

FeSO4

2

76.0

Ferric Sulfate

Fe2(SO4)3

6

66.6

Magnesium Oxide

MgO

2

20.2

Magnesium Bicarbonate

Mg(HCO3)2

2

73.2

Magnesium Carbonate

MgCO3

2

42.2

Magnesium Chloride

MgCl2

2

47.6

Magnesium Hydroxide

Mg(OH)2

2

29.2

Magnesium Phosphate

Mg3(PO4)2

6

43.8

Magnesium Sulfate (anhydrous)

MgSO4

2

60.2

Magnesium Sulfate (Epsom Salts)

MgSO4 . 7H2O

2

123.2

Manganese Hydroxide

Mn(OH)2

2

44.5

Silica

SiO2

2

30.0

Sodium Bicarbonate

NaHCO3

1

84.0

Sodium Carbonate

Na2CO3

2

53.0

Sodium Chloride

NaCl

1

58.4

Sodium Hydroxide

NAOH

1

40.0

Sodium Nitrate

NaNO3

1

85.0

Trisodium Phosphate

Na3PO4 . 12H20

3

126.7

Trisodium Phosphate (anhydrous)

Na3PO4

3

54.7

Disodium Phosphate

Na2HPO4 . 12H2O

2

179.1

Disodium Phosphate (anhydrous)

Na2HPO4

2

71.0

Monosodium Phosphate

NaH2PO4 . H2O

1

138.0

Monosodium Phosphate (anhydrous)

NaH2PO4

1

120.0

Sodium Silicate

Na2SiO3

2

61.0

Sulfuric Acid

H2SO4

2

49.0

Sodium Metaphosphate

NaPO3

1

102.0

Sodium Sulfate

Na2SO4

2

71.0

Sodium Sulfite

Na2SO3

2

63.0

Table 40-2: Conversion Table

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