Question

$0.06\%(w/v)$ aqueous solution of urea is isotonic with

• A. $0.06\%$ glucose solution
• B. $0.6\%$ glucose solution
• C. $0.01M$ glucose solution
• D. $0.1M$ glucose solution

Answer 1

Answer: (C)

$0.06\%(w/V)$ aqueous solution of urea $=\frac{0.06}{100}$

$=6\times 10^{-4}g$

This means that $6\times 10^{-4}g$ of urea is present in $1L$ of solution.

Molecular mass of urea

Molarity of urea solution

$=\frac{w\times 1000}{M\times \text{ volume }(mL)}$

$=\frac{0.06\times 1000}{100\times 60}=0.01M$

$\therefore 0.01M$ glucose solution is isotonic with $0.06\%$ (w/V) solution of urea.