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Which of the following is NOT a colligative property?
Relative lowering of vapour pressure
Elevation of boiling point
Depression of freezing point
Surface tension
Two solutions, A and B, are prepared by dissolving a non-volatile solute in different solvents. Solution A has a higher boiling point elevation than solution B, even though both solutions have the same molality. Which of the following statements is the MOST likely explanation for this observation?
Solution A's solvent has a higher ebullioscopic constant.
Solution A's solvent has a lower ebullioscopic constant.
The solute in solution A dissociates more than the solute in solution B.
The solute in solution B dissociates more than the solute in solution A.
A solution containing a non-volatile solute exhibits an osmotic pressure of 2.0 atm at 298 K. If the same mass of solute is dissolved in twice the volume of the same solvent, what will be the new osmotic pressure at the same temperature?
1.0 atm
2.0 atm
4.0 atm
0.5 atm
A 0.1 molal aqueous solution of a weak electrolyte, HX, freezes at -0.208 Β°C. Assuming ideal behavior, what is the van't Hoff factor (i) for HX in this solution? (K for water = 1.86 K kg mol)
1.00
1.12
1.50
2.00
Two isotonic solutions, A and B, are separated by a semipermeable membrane. Solution A contains a non-electrolyte solute, while solution B contains an electrolyte solute that dissociates into two ions. Which statement accurately describes the initial net movement of solvent?
Solvent will move from solution A to solution B.
Solvent will move from solution B to solution A.
There is no net movement of solvent.
Solvent will move in both directions at equal rates, but there will be no net change.
A solution is prepared by dissolving 1.8 g of a non-volatile solute in 90 g of water. The vapor pressure of the solution is found to be 23.375 mm Hg at 25Β°C. If the vapor pressure of pure water at 25Β°C is 23.76 mm Hg, what is the molar mass of the solute? (Molar mass of water = 18 g/mol)
60 g/mol
180 g/mol
30 g/mol
120 g/mol
A 0.1 molal aqueous solution of a weak acid HA freezes at -0.208Β°C. Assuming the acid to be 25% ionized, calculate the apparent molecular weight of the acid in solution. ( for water = 1.86 K kg molβ»ΒΉ)
90 g/mol
100 g/mol
112.4 g/mol
125 g/mol
The van't Hoff factor for 0.1 M solution at 25 Β°C is 2.74. The degree of dissociation is:
0.87
0.57
0.94
0.47