Question

How many grams of solute should be added in 100 g water to get a solution of density 1.2g/ml and strength 5%(w/v)? (A) 5g (B) 6g (C) 4.17g (D) 4.35g​

Answer 1

Given:

The mass of water, w = 100 gm

The density of solution, d = 1.2 g/ml

The strength of solution, wt % = 5%

To Find:

The mass of solute required to make the following solution.

Calculation:

- The volume of solution = Mass × Density

⇒ V = 100 × 1.2 = 120 ml

- (w/v) % of solution = 5 %

⇒ The mass of solute = (5/100) × 120

⇒ w = 6 gm

- So, the mass of the solute should be 6 gm.

⇒ The correct answer is option (B) 6 gm.