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If freezing point depression is based on colligative properties, meaning the concentration of the solute and not its chemical identity determine how much the freezing point is lowered. Then why, for example, is calcium chloride more effective than sodium cholride at melting water?

2007-11-16 13:04:44 · 2 answers · asked by Anonymous in Science & Mathematics Chemistry

if the same amount of CaCl2 and NaCl are used

2007-11-16 13:06:00 · update #1

Thanks, it makes sense now.

2007-11-16 13:14:50 · update #2

2 answers

Because of the number of "particles" released per mole.

Na+ Cl-

but

Ca++ + 2Cl-

three versus two.

2007-11-16 13:09:37 · answer #1 · answered by steve_geo1 7 · 1 0

because when CaCl_2 Ionizes it gives 3 mols 1 calcium and 2 chlorines but when NaCl ionizes it give 2 moles 1 Sodium and 1 Chlorine

the formula for freezing point depression is based on the number of ions prduced by the solute times the constant times the concentration and since the ions produced by CaCl_2 are 3 the freezing point depression is larger.

2007-11-16 13:12:04 · answer #2 · answered by AJ2986 2 · 1 0

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