Download - COLLIGATIVE PROPERTIES
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COLLIGATIVE PROPERTIES
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Colligative Property A colligative property is a property of
solutions that depends only upon the number of solute particles, not upon their identity.
Types of colligative properties• freezing-point depression• Boiling-point elevation
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Connecting to Your World Cooking instructions often
call for the addition of a small amount of salt to the cooking water. Dissolved salt elevates the boiling point of water. You will learn how to calculate the amount the boiling point of the cooking water rises.
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Remember the formula for molality
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Q:How are freezing-point depression and boiling-point elevation related to molality?
A:The magnitudes of the freezing-point depression (ΔTf) and the boiling-point elevation (Δ Tb) of a solution are directly proportional to the molal concentration (m)
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Freezing Point Depression The freezing point of a solution is lower than the
freezing point of the pure solvent The difference in temperature between the freezing
point of a solution and the freezing point of the pure solvent is called the freezing-point depression.
The constant, Kf, is the molal freezing-point depression constant
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Freezing Point Depression
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Freezing Point Depression
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Boiling Point Elevation The boiling point of a solution is higher than the
boiling point of the pure solvent.• The difference in temperature between the boiling
point of a solution and the boiling point of the pure solvent is the boiling-point elevation.
The constant, Kb, is the molal boiling-point elevation constant
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Boiling Point Elevation
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Boiling Point Elevation
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