Some Basic Concepts Of Chemistry Question 307

Question: 250 ml of a sodium carbonate solution contains 2.65 grams 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]

Options:

A) 0.1 M

B) 0.001 M

C) 0.01 M

D) 104, M

Show Answer

Answer:

Correct Answer: B

Solution:

Molarity =W(gm)×1000molecular wt.×V(ml.)

=2.65×1000106×250=0.1M

10ml of this solution is diluted to 1000ml N1V1=N2V2

10×0.1=1000×x

x=0.1×101000=0.001M .



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