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Some Basic Concepts of Chemistry
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12/08/2021 12:23 pm
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250 mL of a sodium carbonate solution contains 2.65 g 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)
(a) 0.1 M
(b) 0.01 M
(c) 0.001 M
(d) 10-4 M
1 Answer
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12/08/2021 12:29 pm
Correct answer: (c) 0.001 M
Explanation:
Molarity
= \(\frac{Wt \times 1000}{MW \times V}\)
= \(\frac{2.65 \times 1000}{106 \times 250}\) = 0.1 M
\(M_1V_1\) = \(M_2 V_2\)
∴ 10 x 0.1 = 1000 x \({M_2}\) = 0.001M