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In the reaction
2NaOH + H₃PO₄ → Na₂HPO₄ + 2H₂O, the Equivalent weight of the acid is

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32.6

36.5

answer is A.

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Detailed Solution

Molar mass of phosphoric acid is 98 g/mol. Equivalent weight of phosphoric acid is calculated by dividing the molar mass of the acids with number of hydrogen ions donated by acids.

As phosphoric acid donates 2H⁺ ions, therefore its equivalent weight is:

$Equivalent weight = \frac{98}{2} = 49$

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