306ColligativeProperties2

# 306ColligativeProperties2 - Freezing point depression(DTf...

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Lesson 15 1 Lesson 15 Freezing point depression ( D T f ) Lesson 15 Freezing point depression Lesson 15 Freezing point depression • An equation similar to the one used to calculate boiling point elevation ( D T b ) is used for freezing point depression ( D T f ): D T f = – iK f m • Notice that K f depends only on the solvent type.

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Lesson 15 2 Lesson 15 Lesson 15 Example 1 What weight of ethylene glycol (C 2 H 6 O 2 ) must be added to 1 000 g of water to lower the freezing point to –10 °C? Data : K f = 1.86 K/ m Lesson 15 Example 2 The freezing point depression constant for HgCl 2 is 34.3 K/ m *. For a solution of 0.849 g of mercurous chloride (empirical formula HgCl) in 50 g of HgCl 2 , the freezing point depression is 1.24 °C. What is the molecular weight of mercurous chloride? What is its molecular formula? * m is molality
Lesson 15 3 Lesson 15 Example 3 The freezing point depression of a 0.10 molal solution of HF(aq) solution is –0.201 °C. Calculate the percentage dissociation of HF(aq). Lesson 15

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306ColligativeProperties2 - Freezing point depression(DTf...

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