Some Basic Concepts Of Chemistry Question 62
Question: 250 mL of a sodium carbonate solution contains 2.65 g of $ Na _2CO _3. $ If 10 mL of this solution is diluted to one litre, what is the concentration of the resultant solution? (mol. wt. of $ Na _2CO _3=106 $ )
Options:
A) 0.1 M
B) 0.01 M
C) 0.001 M
D) $ {10^{-4}}M $
Show Answer
Answer:
Correct Answer: C
Solution:
[c] Molarity $ \frac{Wt\times 1000}{MW\times V}=\frac{2.65\times 1000}{106\times 250}=0.1M $ $ M _1V _1=M _2V _2 $
$ \therefore 10\times 0.1=1000\times M _2=0.001M $
