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Q81) 250ml of a sodium carbonate solution contains 2.65g of Na2CO3. If 10 ml of this solution is diluted to one litre, what is the concentration of the resultant solution? [ mol.wt of Na2CO3=106] [ EAMCET 2001]


wt in 10 ml=(2.65/250)×10=0.106 g
0.106g=0.001 mole
Since 10 ml is diluted to one litre molarity=0.001 M
Answer: (b)