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Question

The normality of orthophosphoric acid having purity of % by weight and specific gravity is:

A

B

C

D

Hard

Solution

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Correct option is
C

Density of orthophosphoric acid () = specific gravity density of water

Density of orthophosphoric acid g/ml

So mass in ml g.
Gram equivalent weight of orthophosphoric acid  g-eq.

As the orthophosphoric acid is only % pure
So the weight of orthophosphoric acid   g.
Number of gram equivalents of orthophosphoric acid   

So, the gram equivalents in ml N. 

as N.

Hence, the correct option is

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