What is the equivalent mass of H3PO4 (molar mass 98 g mol^-1) in the reaction H3PO4 + 2NaOH -> Na2HPO4 + 2H2O?

NEET levelSingle correct optionDifficulty 1 of 3eq001

What is the equivalent mass of $H X_{3} PO X_{4}$ (molar mass $98 g mo l^{- 1}$ ) in the reaction $H X_{3} PO X_{4} + 2 NaOH Na X_{2} HPO X_{4} + 2 H X_{2} O$ ?

The n-factor of an acid equals the number of

H X^{+}

ions replaced per molecule. Here two

H X^{+}

are replaced, so

n = 2

and equivalent mass

= 98/2 = 49

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