Question

the concentration (w/w)% of a 200g solution of common salt is 10%. if 20g more water is mixed in it then it's concentration becomes
(I) 10.10%
(2) 11.11%
(3) 9.99%
(4) 9.09%​

Answer 1

Answer:

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Explanation:

OPTION A

Answer 2

If 20g more water is mixed in it then the concentration of solution becomes 9.09%

Therefore, option (4) is correct.

Explanation:

Let the weight of sugar in the initial concentration was x

We know that

concentration of a solution (w/w) % = (Weight of solute/Weight of solution) × 100

Given that the initial concentration is 10% and the weight of solution is 200 g

Therefore,

$10=\frac{x}{200}\times 100$

$\implies x=20$ gram

If 20 g more water is added

Then the weight of solution = 200 + 20 = 220 gram

The new concentration

$=\frac{20}{220}\times 100$

$=9.09\%$

Hope this answer is helpful.

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