Question

100 g of water is evaporated form a 600 g of 10% (w/w) aqueous solution of common salt. The concentration (w/w) of the new solution will be

Answer 1

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Answer 2

100g of water is evaporated from a 600g of 10 % (w/W) aqueous solution of common salt.

we have to find the concentration (w/W) of the new solution.

solution : initial mass of solution = 600g

10% by weight common salt present in the aqueous solution of 600g

so mass of common salt = 10 % of 600 = 60g

mass of water ( solvent ) = 600 - 60 = 540 g

now 100g of water is evaporated.

so, mass of water would be 540 - 100 = 440g

new mass of solution = 440g + 60g = 500g

% concentration (w/W) = mass of solute/mass of solution × 100

= 60/500 × 100

= 12 %

Therefore concentration of new solution is 12 % (w/W)