equivalent mass of H3PO4 for the given reaction

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

EQUIVALENT MASS IS SAME FOR ALL THE REACTION.

MOLECULAR MASS = 3 * 1 + 1 * 31 + 4 * 16

= 3 + 31 + 64 = 98

EQUIVALENT MASS = MOLECULAR MASS / NO. OF REPLACEABLE HYDROGEN ATOMS

= 98 /2

= 49