Explanation Ions in solution can depress/decrease the freezing point of a solution. Typically, it depends on the type of solvent and the molality of solution. Recall that molality is the amount of moles of solute per unit kilogram of solvent. The equation we need is given next: m o l a l i t y = m o l o f s o l u t e k g o f s o l v e n t T f r e e z i n g = T n o r m a l − ( i ) ( m o l a l i t y ) ( K f ) Where “i” is the amount of ions in solution, and K f is the depression constant for water, which stands for (a) Lactose solution 1 s t .Step: Calculate molality m o l a l i t y = m o l o f s o l u t e k g o f s o l v e n t = 0.580 m o l 1 k g = 0.58 m o l a l m o l a l i t y = m o l 2 n d .Step: Calculate freezing point T f r e e z i n g = T n o r m a l − ( i ) ( m o l a l i t y ) ( K f ) T f r e e z i n g = 0 ° C − ( 1 ) ( 0.58 ) ( 1.8 ) ° C T f r e e z i n g = − 1.04 ° C (b) KCl 1 s t .Step: Calculate molality m o l a l i t y = m o l o f s o l u t e k g o f s o l v e n t = ( ( m a s s m o l a r w e i g h t ) k g o f s o l v e n t ) = 45

6th Edition

ISBN: 9780134878119

Author: Timberlake, Karen C. , William

Publisher: Pearson,

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Question

Chapter 12, Problem 129APP

Interpretation Introduction

Interpretation:

Calculate the freezing point using colligative properties

Concept introduction:

The freezing point can be depressed due ions in solution

Freezing point can be calculated using molality

To calculate: the freezing point of the solutions

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Chapter 12, Problem 128APP

Chapter 12, Problem 130APP

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Chapter 12 Solutions

Basic Chemistry

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Knowledge Booster

Calculate the freezing point using colligative properties Concept introduction: The freezing point can be depressed due ions in solution Freezing point can be calculated using molality To calculate: the freezing point of the solutions

Solution Summary: The author explains how ions in solution can depress/decrease the freezing point of a solution, depending on the type of solvent and the molality of solution.

Interpretation: Calculate the freezing point using colligative properties Concept introduction: The freezing point can be depressed due ions in solution Freezing point can be calculated using molality To calculate: the freezing point of the solutions

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Chapter 12 Solutions

Interpretation:

Calculate the freezing point using colligative properties

Concept introduction:

The freezing point can be depressed due ions in solution

Freezing point can be calculated using molality

To calculate: the freezing point of the solutions