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. 0.01 M
B. 0.001 M
C. 0.05 M
D. 0.002 M

Answer

D

Explanation

Molarity of `Na_2CO_3` solution `=2.65/106xx1000/250=0.1 M`
10 mL of this solution is diluted to 500 mL
`M_1V_1=M_2V_2`
`0.1 xx 10 = M_2 xx 500 rArr M_2 `=0.002 M