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Question

1L solution of a diacidic base was prepared by dissolving 5.30g of it in water. For complete neutralization 30mL of this solution required 18mL of N/6 HCl. Calculate equivalent mass and molecular mass of the base.

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Solution

For neutralisation reaction
(complete)
eq. of acid = eq. of base
conc of diacidic base× volume= conc of acid × volume of acid
x×30ml=N6×18ml
x=N10 (conc of diacidic base)
Since it's diacidic base
Its Molarity =M20 (Acidity=2)
[Using: Normality= molarity× acidity]
It's molarity is 120, that means 1 litre solution contains 120 moles of the base.
And according to the question, 120 moles have weight 5.30g.
1 mole20×5.3
=106g=molar mass
Eq mass=molarmassacidity=1062=53g.

1121218_829948_ans_1d2168223b2f46b0bfc2b221af36cd53.jpg

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