1.

250 mL of 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_(2)CO_(3) = 106)

Answer»

0.1 M
0.001 M
0.01 M
`10^(-4)` M

Solution :MOLARITY of given `N_(2)CO_(3)` solution
`=2.65/106 XX 1/250 xx 1000 = 0.1 M`
`M_(1)V_(1) = M_(2)V_(2)` or `10 xx 0.1 = 1000 xx M_(2)` or `M_(2) = 0.001 M`


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