Question

A teacher told three students A, B and C to prepare 25% solution (mass by volume) of KOH. Student A dissolved 25 g of KOH in 100 g of water, student B dissolved 25 g of KOH in 100 mL of water and student C dissolved 25 g KOH in water and made the volume 100 mL. Which one of them has made required 25% solution? Give your answer with reason. (5 marks question)

Answer 1

Answer:

Student C

Solution-25 gm of KOH in water and the volume of the solution is 100 ml.

Mass by volume percentage of solution =

Refer image 1

Detailed Answer:

Student C made the required 25% solution.

25 gm of KOH in water and the volume of the solution is 100 ml.

Mass by volume percentage of a solution =

Refer image 2

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Answer 2

Student C

Solution-25 gm of KOH in water and the volume of the solution is 100 ml.

Mass by volume percentage of solution =

Mass of solute /mass of solution *100=25g/100ml*100

Detailed Answer:

Student C made the required 25% solution.

25 gm of KOH in water and the volume of the solution is 100 ml.

Mass by volume percentage of a solution =
mass of solute / volume of solute*100=25/100*100=25%