20ml of 0.25 N strong acid and 30 ml 0.2 N of strong base are mixed, the resulting solution is

Options

A. 0.02 N acidic
B. 0.025 N basic
C. 0.02 N basic
D. 0.025 N acidic

Answer

C

Explanation

20 ml of 0.25 N strong acid and 30 ml of 0.2 N of strong base are mixeed. Total volume of the solution 50 ml and strength x(N).
1 ml of 1 N acid`-=1ml` of 1 N base
20 ml of 0.25 N acid`-=20xx0.25` ml of a 1(N) acid
=5 ml of 1(N) acid
30 ml of 0.2 N base`-=30xx0.2ml` of 1(N) base
`=6` ml of 1(N) base
`therefore(6-5)=1ml` of 1(N) base still remain in the mixture.
`50xx x-=1xx1` or `x=(1)/(50)=0.02`
The strength of the resulting solution is 0.02 N.