Question

50cc of N/100 HCl neutralized 42 cc of No2CO3. How nich to water must be added to 1 liter solution of Na2CO3 to make it exacly N/10??​

Answer 1

Answer:

Answer

Correct option is

D

490 ml

Let normality of H

2

SO

4

=N

N

1

V

1

=N

2

V

2

⇒0.1×22.7=N×10.2

⇒N=0.2225

Now the number of equivalent present in

400ml solution= N×400

=0.2225×400=89meq

For making the solution of 0.1N, Let V ml of solution is needed

⇒0.1×V=89

V=890ml

Hence the volume of water that must be added is 400ml

∴V=890−400=490ml