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Which one of the following is an isotonic pair of solutions?
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$0.15 \mathrm{M} \mathrm{NaCl}$ and $0.1 \mathrm{M} \mathrm{Na}_2 \mathrm{SO}_4$
Two solutions are isotonic if they have same molar concentrations of the particles.
(a) $0.15 \mathrm{M} \mathrm{NaCl}$ and $0.1 \mathrm{M} \mathrm{Na}_2 \mathrm{SO}_4$
$\mathrm{NaCl}$ is an electrolyte which dissociates to give 2 ions, thus concentration of ions in the solution $0.30 \mathrm{M}$.
Similarly for $\mathrm{Na}_2 \mathrm{SO}_4$ (3 ions), the concentration of ions in the solution $=0.30 \mathrm{M}$. Hence, both are isotonic.
(a) $0.15 \mathrm{M} \mathrm{NaCl}$ and $0.1 \mathrm{M} \mathrm{Na}_2 \mathrm{SO}_4$
$\mathrm{NaCl}$ is an electrolyte which dissociates to give 2 ions, thus concentration of ions in the solution $0.30 \mathrm{M}$.
Similarly for $\mathrm{Na}_2 \mathrm{SO}_4$ (3 ions), the concentration of ions in the solution $=0.30 \mathrm{M}$. Hence, both are isotonic.
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