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Question

25gm mixture of Na2CO3 and Na2SO4 are dissolved in 250ml of solution. 25ml of above solution required 20ml of 0.1N H2SO4 using phenolphthalein indicator. The mass of Na2CO3 in the mixture is:

A
1.5gm
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B
2.12gm
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C
2.05gm
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D
1.6gm
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Solution

The correct option is A 1.5gm
When a mixture of Na2CO3 and Na2SO4 are dissolved in H2SO4,Na2SO4 being similar to H2SO4 anions, does not involve in H2SO4.

So, Gram equivalent of Na2CO3 = Gram equivalent of H2SO4
moles × n-factor = Normality × Volume
.
w106×2=0.1×201000

w=2×1061000×2

w=1.5gm
Option A is correct

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