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The normality of orthophosphoric acid having purity of 70 % by weight and specific gravity 1.54 is:

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The normality of orthophosphoric acid having purity of 70 % by weight and specific gravity 1.54 is:

(a) 11 N

(b) 22 N

(c) 33 N

(d) 44 N

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(c) 33 N

Explanation:

70% by weight means

Wt. of solute = 70 g

Wt. of solution = 100 g

∴ Vcc of solution = mass/density = 100/1.54

We know that

N = W x 1000/Eq. Wt x Vcc

= 70 x 3/98 x 1000 x 1.54/100

= 33N

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