Which of the following aqueous solutions is isotonic with $0.10 M$ glucose at the same temperature? (Assume ideal behaviour and complete dissociation of electrolytes.)

A $0.10 M$ $NaCl$
B $0.20 M$ sucrose
C $0.10 M$ $CaCl X_{2}$
D $0.10 M$ urea, $CO (NH X_{2}) X_{2}$

Answer: D

Isotonic solutions have equal osmotic pressure, i.e. equal total concentration of solute particles at the same temperature. Glucose and urea do not dissociate, so

0.10 M

urea has

0.10 mol

particles per litre like glucose.

NaCl

gives

0.20

CaCl X_{2}

gives

0.30

and

0.20 M

sucrose gives

0.20 mol L^{- 1}

of particles.

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Which of the following aqueous solutions is isotonic with 0.10 M glucose at the same temperature? (Assume ideal behaviour and complete dissociation of electrolytes.)

Answer: D

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Which of the following aqueous solutions is isotonic with $0.10 M$ glucose at the same temperature? (Assume ideal behaviour and complete dissociation of electrolytes.)