Formula

No.Of Equivalents

Equivalent Weight

Positive Ions

Aluminium

Al +++

3

9.0

Ammonium

Nh₄ ⁺

1

18.0

Calcium

Ca ^}

2

20.0

Copper

Cu++

2

31.8

Hydrogen

H+

1

1.0

Ferrous Ion

Fe++

2

27.9

Ferric Ion

Fe+++

3

18.6

Magnesium

Mg++

2

12.2

Manganese

Mn++

2

27.5

Potassium

K+

1

39.1

Sodium

Na⁺

1

23.0

Negative Ions

Bicarbonate

HCO₃ ^-

1

61.0

Carbonate

Co3 --

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)

PO ---

4-

3

31.7

Phosphate    (Dibasic)

HPO₄ ^--

2

48.0

Phosphate (Monobasic)

H₂PO₄ ^-

1

97.0

Sulfate

SO4--

2

48.0

Bisulfate

HSO₄ ^-

1

97.1

Sulfite

SO3 --

2

40.0

Bisulfite

HSO₃ ^-

1

81.1

Sulfide

S --

2

16.0

Compounds

Alum

Al₂ (SO₄)₃ ^-18 H₂O

6

111.0

Aluminium Sulfate (Anhydrous)

Al₂ (SO₄)₃

6

57.0

Aluminium Hydroxide

Al (Oh)₃

3

26.0

Aluminium Oxide

Al₂ O₃

6

17.0

Ammonia

NH₃

1

17.0

Sodium Aluminate

Na₂Al₂O₄

6

27.0

Calcium Bicarbonate

Ca (HCO₃)₂

2

81.1

Calcium Carbonate

CaCO₃

2

50.0

Calcium Chloride

CaCl₂

2

55.5

Calcium Hydroxide

Ca(OH₂)

2

37.0

Calcium Oxide

CaO

2

28.1

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

Magnesium Hydroxide

Mn (OH)₂

2

44.5