Question
Which of the following solutions will have maximum boiling point elevation and which have minimum freezing point depression assuming the complete dissociation? (a) $0.1\ m\ KCl$ (b) $0.05\ m\ NaCl$ (c) $1\ m\ AlPO_4$ (d) $0.1\ m\ MgSO_4.$
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Answer
Boiling point elevation and freezing point depression are colligative properties that depend on number of particles in solution.
The solution having more number of particles will have large boiling point elevation and that having less number of particles would show minimum freezing point depression.
$AlPO_4$ solution contains highest moles and hence highest number particles and in turn, the maximum $\triangle T_b$.
$NaCl$ solution has minimum moles and particles, it has minimum $\triangle T_f$.
The solution having more number of particles will have large boiling point elevation and that having less number of particles would show minimum freezing point depression.
$AlPO_4$ solution contains highest moles and hence highest number particles and in turn, the maximum $\triangle T_b$.
$NaCl$ solution has minimum moles and particles, it has minimum $\triangle T_f$.
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