Question

A solution of specific gravity 1.6 is 67% by weight. What will be % by weight of the solution of same acid if it is diluted to specific gravity 1.2 ?

Answer 1

Consider 100 mL of Solution 67% by weight  ∴ Wt. of Solution = 100 x 1.6 = 160 g Now suppose X g of H2O added in it Wt. of new Solution = (160 + X) g  Also volume of new Solution = (100 + X) mL  ∴ Wt. of new Solution = (100 + X) x 1.2 g = (120 +1.2 X)g  ∴160 +X = (120 + 1.2 X) g or X = 200 mL or 200g

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