Question

Srivani tested the solubility of potassium chloride in water at different temperatures and collected the data as given below.
$$\begin{array}{cccccc}\text{Temperature (degree celsius)}& \text{20}& \text{30}& \text{40}& \text{50}& \text{60}\\ \text{Solubility (g per 100 ml)}& \text{34.2}& \text{37.2}& \text{40.1}& \text{42.6}& \text{45.8}\end{array}$$

What amount of salt is reqired to make a saturated solution with 200 mL of water at ${40}^{\circ }C$ ?

• A. 40.1 g
• B. 85.2 g
• C. 80.2 g
• D. 45.8 g

Answer 1

The correct option is C

80.2 g

From the table, At, ${40}^{\circ }$ the solubility of potassium chloride = 40.1 g per 100 ml

Given, amount of solvent = 200 ml

So, the amount of salt required to make a saturated solution =$\frac{40.1g}{100ml}\times 200ml=80.2g$