Question

The volume of water must be added to 100 ml of 0.5 M NaOH solution to get 0.2 M solution is
a) 50 ml
b) 100 ml
c) 150 ml
d) 200 ml ​

Answer 1

Answer:

c) 150 ml

Explanation:

molarity of the solution initially : M1 .5 M

volume of the solution initially : V1 100 ml .1 litre

molarity of solution after dilution M2 : . 2M

volume of the solution after dilution V2: to be determined

Formula used: V1M1 equals to V2M2

then V2 equals to V1M1/M2 equals to .1 x.5/.2 equals to .25 litres equals to 250 ml

volume of solvent to be added to get the dilute solution : 250 ml - 100 ml equals to 150 ml

Ans : 150 ml