Question

(28) In school laboratory, one teacher give instruction to
class-9 three students Manthan, Harshil and Tirth for
making solution of concentration 50% W/V NaOH.
Manthan : Dissolve 50 g NaOH in 100 ml water.
Harshil : Dissolve 50 g NaOH in 100 g water.
Tirth : Dissolve 50 g NaOH in some water and make
the solution 100 ml.
​

Answer 1

Manthan did it in right way...50 g NaOH in 100 ml water will give u 50% w/v of solution.

Answer 2

Student C makes the desired solution because he adds water to produce a 100 ml solution after Students A and B prepare a 150 ml solution.50g of NaOH are dissolved in 100ml of solution, or 50% mass by volume. C, therefore, creates the answer.

A has already consumed 100 ml of water and makes 150 ml of solution. As a result, A fails to provide the anticipated outcome.

B consumed 100 grams of water also makes 150 g of solution. Therefore, the solution won't be 50% mass by volume for either A or B.