Frequently Asked Questions
What are colligative properties?
Colligative properties depend only on the number of dissolved particles, not their identity. They include boiling point elevation, freezing point depression, vapor pressure lowering, and osmotic pressure.
What is the van t Hoff factor?
The van t Hoff factor is the number of particles a solute produces when it dissolves. Sugar gives a factor of about one, while table salt splits into two ions for a factor near two.
Why use molality instead of molarity?
Molality is moles of solute per kilogram of solvent and does not change with temperature, while molarity depends on volume which expands or contracts with temperature.
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