Question

4. During an experiment the students were asked to prepare a 5% (mass/mass) solution of potassium chloride in water. Which of the following correctly represents the composition of the solution? A. 5 g of KCl + 100 g of water B. 5g of KCl + 95 g of water C. 0.5 g of KCI + 99.95 g of water D. 0.05 g of KCl + 100 g of water g​

Answer 1

Option (B) is correct

5 g of KCl is present in 100 g of Solution means

5 g of KCl is present in 95 g of H20 .

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Answer 2

A. 5 g of KCl + 100 g of water correctly represents compostion of solution.

• Mass by mass percentage of a solution represents mass of solute and mass of solution.
• Thus, 5% (mass/mass) solution of potassium chloride in water means 5 grams of potassium chloride is present in 100 grams of water.
• In the given solution, potassium chloride is solute and water is solvent.
• Therefore, mass of solvent will be = mass of solution - mass of solute.
• Mass of solution = 100 - 5 So, mass of solvent is 95 grams.