COLIGWS5 - CHEMISTRY COLLIGATIVE PROPERTIES WORKSHEET...

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Colligative properties are properties that depend only upon the number of solute atoms, ions, or molecules in a solution and not on the nature of those atoms, ions or molecules. Freezing point depression and boiling point elevation are examples of colligative properties. Raoult discovered that the addition of solute particles causes the boiling point of a solution to be elevated and the freezing point to be depressed. It has been found that 1 mole of nonvolatile, nonionizing solute particles will raise the boiling point of 1.0 kg of water by 0.52 °C, to 100.52°C at 1 atm of pressure. The same concentration will lower the freezing point of 1.0 kg of water by 1.86°C, to -1.86°C. These two numbers apply only to water and are called the molal boiling point and freezing point constants for water. Other solvents have different constants. EXAMPLE #1 If 90.0 g of nonionizing C 6 H 12 O 6 , are dissolved in 255 g of H 2 O, what will be the boiling point of the resulting solution? First calculate the molality (m) of the solution: Next apply the boiling point elevation equation: [i = 1 for a nonionizing solute.] ΔT b = i K b m ΔT b = (1)(0.52°C/m)(2.0 m) ΔT b = 1.04 °C BP = (ΔT b + 100.00 °C) BP =( 1.04°C + 100.00 °C) = 101. 04°C CHEMISTRY COLLIGATIVE PROPERTIES WORKSHEET i = 1 for substances that do not ionize 2 for substances which ionize into
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COLIGWS5 - CHEMISTRY COLLIGATIVE PROPERTIES WORKSHEET...

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