250 mL of a sodium carbonate solution contains 2.65 g `Na_(2)CO_(3)`. If 10 mL of this solution is diluted to one litre, what is the concentration of resultant solution?

Options

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

Answer

B

Explanation

`V = 250 mL, W = 2.65 g` of `Na_(2)CO_(3)`
`V_(1) = 10 mL, V_(2) = 1000 mL`
`Molarity(M_(1)) = W/GMW xx 1000/V(mL) = 2.65/106 xx 1000/250 = 0.1 M`
`:. M_(1)V_(1) = M_(2)V_(2)`
`0.1 xx 10 = M_(2) xx 1000`
`implies M_(2) = 0.1xx10/1000 = 0.001 M`