Question

78. What is the normality of
0.3 M H3PO4, when it undergoes
the reaction as :
H3PO4 + 2OH- → HPO3- +2H20
(a) 0.3 N
(b) 0.15 N
(c) 0.6 N
(d) 0.9 N​

Answer 1

H3PO4 + 2OH ^- → HPO3^-2 +2H20

Normality =nfactor×molarity

N factor=Number of H+ ions replaced.

Here n factor is 2 ,since 2 H+ ions are replaced.

Normality =2×0.3=0.6N

Hence option C is coorrect

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