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Synthesize the calculation of concentration, vapour pressure, and colligative properties with abnormal molar mass corrections.
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Checklist of all major chapter capabilities.
Progressive difficulty MCQs spanning the chapter.
Which of the following concentration units is a function of temperature?
Source explanation questions.
Focus on how adding alcohol affects the existing hydrogen bonds in water, and what type of deviation from Raoult's law this causes.
Focus on the enthalpy of dissolution (exothermic/endothermic) and Le Chatelier's Principle.
Focus on comparing solute-solvent vs solute-solute interactions and state whether heat is absorbed or released for each deviation type.
Complex calculation from end-of-chapter exercises.
Synthesis Challenge (Adaptation of Ex 1.20)
A 5% solution (by mass) of cane sugar (, molar mass = ) in water has a freezing point of 271 K.
Calculate the freezing point of a 5% glucose (, molar mass = ) solution in water if the freezing point of pure water is 273.15 K.
List the knowns. Hint: Assume 100 g of solution to find the mass of solute and mass of solvent.
State the formula for freezing point depression.
Find the depression ΔTf for sugar, determine its molality, and calculate Kf.
Show the calculation for glucose's freezing point depression.
Subtract the glucose ΔTf from the pure water freezing point. Include units.
Why should the freezing point of the glucose solution be lower than the sugar solution?
Osmotic pressure incorporating van't Hoff factor.
Synthesis Challenge: Osmotic Pressure with Dissociation (Ex 1.41)
Determine the osmotic pressure of a solution prepared by dissolving 25 mg of in 2 liters of water at 25 °C, assuming that it is completely dissociated.
Assume molar mass of = . Use gas constant (or state if you use ).
Provide your final calculated value with appropriate units.
Show how you converted mass to moles, determined molarity, established the van't Hoff factor, and applied the osmotic pressure formula.
Briefly note how the calculated pressure compares to what it would be if K2SO4 did not dissociate.