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  4. In the reaction, H3PO4+Ca(.OH(.)2 arrow CaHPO4+2H2O, the equivalent mass of H3PO4 is

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Q. In the reaction, $H_{3}PO_{4}+Ca\left(\right.OH\left(\left.\right)_{2} \rightarrow CaHPO_{4}+2H_{2}O,$ the equivalent mass of $H_{3}PO_{4}$ is

NTA AbhyasNTA Abhyas 2022

Solution:

In the reaction
$H_{3}PO_{4}+Ca\left(\right.OH\left(\left.\right)_{2} \rightarrow CaHPO_{4}+2H_{2}O,$
Basicity of phosphoric acid is 3.
Thus, equivalent mass of $H_{3}PO_{4}=\frac{M o l e c u l a r m a s s}{B a s i c i t y}$
$=\frac{98}{3}=32.7g$ .