Question

At the same temperature which of the following solutions will be isotonic?

• A. 3.42 g of sucrose per litre of water and 0.18 g of glucose per litre of water.
• B. 3.42 g of sucrose per litre of water and 0.18 g of glucose in 0.1 litre of water.
• C. 3.42 g of sucrose per litre of water and 0.585 g of sodium chloride per litre of water.
• D. 3.42 g of sucrose per litre of water and 1.17 g of sodium chloride per litre of water.

Answer 1

Answer: (B)

For isotonic solution, $π_1 = π_2$ or $C_1 = C_2$
For 3.42 g sucrose in 1 L of water and 0.18 g glucose in 0.1 L of water.
$\frac{3.42}{342\times1} = \frac{0.18}{180\times0.1}$ or $0.01 = 0.01$
$\therefore \quad$ They are isotonic.