250 ml of a sodium carbonate solution contains 2.65 grams of `Na_(2)CO_(3)`. If 10 ml of this solution is diluted to one litre, what is the concentration of the resultant solution (mol. Wt. of Na_(a)`CO_(3)=106`)

Options

A. 0.1 M
B. 0.001 M
C. 0.01 M
D. `10^(-4)` M

Answer

B

Explanation

Molarity `=(W(gm)xx1000)/("molecular wt."xxV(ml.))=(2.65xx1000)/(106xx250)=0.1 M`.
10 ml of this solution is diluted to 100 ml `M_(1)V_(1)= M_(2)V_(2)`
`10xx0.1=1000xx x`
`x=(0.1xx10)/1000=0.001 M`