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Quiz: Colligative Properties of Solutions

A chemist dissolves 1 mol of NaCl in a 2.0-kg sample of water, then dissolves 1 mol of sucrose in another 2.0-kg sample of water. Why does the NaCl solution have the lower freezing point?

Ions require more energy to dissolve than molecular compounds do.

Sagot :

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Final answer:

Colligative properties are based on the number of solute particles in a solution. Solutions with more particles show greater deviation in freezing point depression. NaCl solution has a lower freezing point compared to sucrose because NaCl produces more ions, affecting colligative properties.


Explanation:

Colligative properties depend on the number of dissolved particles in a solution. When NaCl dissolves, it separates into two ions, Na+ and Cl-, while CaCl2 separates into three ions. Thus, CaCl2 will have a greater impact on freezing point depression than NaCl due to the higher number of particles produced.


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