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Q62 (CDS-I/2021) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Basic chemical principles Answer Verified

A solution contains 20 g of solute in 180 g of solvent. If the solvent is water, what is the concentration of the solution in terms of mass by mass percentage ?

Result
Your answer: —  Â·  Correct: C
Explanation

To calculate the concentration of a solution in terms of mass by mass percentage, the formula used is (Mass of Solute / Mass of Solution)!! 100. The mass of the solution is the sum of the mass of the solute and the mass of the solvent. In this case, the mass of the solute is 20 g and the mass of the solvent (water) is 180 g. Therefore, the total mass of the solution is 20 g + 180 g = 200 g. Applying the formula: (20 / 200)!! 100 = 10%. This calculation follows the standard chemical principle for expressing concentration as a weight/weight percentage (w/w%), where the denominator must represent the total mixture rather than just the solvent.

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