Colligative Properties of Solutions
Chemistry ⇒ Solutions and Colloids
Colligative Properties of Solutions starts at 11 and continues till grade 12.
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A 0.2 molal solution of KCl is prepared. Assuming complete dissociation, what is the van't Hoff factor (i) for KCl?
A 0.5 molal solution of a non-electrolyte in benzene (Kf = 5.12 K kg/mol) lowers the freezing point by _______ K.
A solution containing 0.1 mol of a non-volatile solute in 1 kg of water has a freezing point of -0.186°C. What is the Kf of water?
A solution containing 0.1 mol of NaCl in 1 kg of water freezes at -0.372°C. Calculate the van't Hoff factor (i) if Kf for water is 1.86 K kg/mol.
A solution is prepared by dissolving 10 g of urea (molar mass = 60 g/mol) in 250 g of water. Calculate the molality of the solution.
A solution of 0.2 molal NaCl in water freezes at -0.744°C. If Kf for water is 1.86 K kg/mol, calculate the van't Hoff factor (i).
A solution of 5 g of a non-volatile solute in 100 g of water has a vapor pressure of 735 mmHg at 373 K. The vapor pressure of pure water at this temperature is 760 mmHg. Calculate the mole fraction of the solute.
Define the term 'colligative property'.
Describe the effect of adding a non-volatile solute on the vapor pressure of a solvent.
Describe the process of reverse osmosis and its application.
Explain the term 'abnormal molar mass' in the context of colligative properties.
Explain the term 'isotonic solution'.
Explain why electrolytes have a greater effect on colligative properties than non-electrolytes at the same concentration.
Explain why the freezing point of seawater is lower than that of pure water.
State Raoult's Law.
The boiling point elevation constant (Kb) for water is 0.52 K kg/mol. What is the boiling point of a solution containing 1 molal non-volatile solute?
The freezing point depression constant (Kf) for water is 1.86 K kg/mol. What is the freezing point of a solution containing 0.5 molal NaCl, assuming complete dissociation?
The osmotic pressure of a 0.1 M solution at 300 K is 2.46 atm. What is the value of the gas constant R used in the calculation?
