the normality of 1M solution of H3 PO4 is: [ H=1, P=31, O=16]
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1 mol of H
3
PO
4
gives 3 moles of H
+
ions
In Phosphoric acid (H
3
PO
4
) no. of H
+
ions it produces on dissociation per molecule of acid is 3. Hence the n-factor for phosphoric acid H
3
PO
4
is 3.
Normality= Molarity ×n−factor
=1× 3 =3 N
Hence, the correct option is D
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