Question

Calculate the equivalent weight of phosphate radical

Answer 1

Equivalent weights may be calculated from molar masses if the chemistry of the substance is well known: sulfuric acid has a molar mass of 98.078(5) g mol−1, and supplies two moles of hydrogen ions per mole of sulfuric acid, so its equivalent weight is 98.078(5) g mol−1/2 eq mol−1 = 49.039(3) g eq−1.

Answer 2

The equivalent weight is equal to the molecular weight divided by the valence.

For example: The equivalent weight of H2SO4 is calculated as =Molecular weight/valence
The valence is valence refers to how many hydrogen atoms could bond with the compound.

Here Valence is 2 since there are 2 H in H2SO4

Thus Equivalent weight = 98/2

= 49.5