The equivalent weight of H3PO4 in following reaction

H3PO4 + Ca(OH)2 ---> CaHPO4 +2 H2O

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Solution

Equivalent weight stands for Molecular weight/N factor

N factor means H+ or OH- exchange in case of acid and bases respectively and in case of salts it is charge on cation

now , in given Question mass of H3PO4 is 98 and N factor is 2 as 2H are donated

so equivalent weight is 98/2= 49

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