Question

Solutions $A$ , $B$ , $C$ and $D$ are respectively $0.1M$ glucose, $0.05MNaCl$ , $0.05MBaC{l}_2$ and $0.1MAlC{l}_3$ . Which one of the following pairs is isotonic ?

• A. $A$ and $B$
• B. $B$ and $C$
• C. $A$ and $D$
• D. $A$ and $C$

Answer 1

Answer: (A)

Isotonic solutions have same molar concentration of solute particles in solution. Molar concentration of particles in solution are $0.1M$ in glucose, $2\times 0.05M$ in $NaCl,3\times 0.05$ in $BaC{l}_2$ and $4\times 0.1$ in $AlC{l}_3.$ Therefore, $0.1M$ glucose and $0.05MNaCl$ solutions are isotonic.