Chemistry · Colligative properties of dilute solutions: a relative lowering of vapour pressure, depression of freezing point, the elevation of boiling point and osmotic pressure
Which of the following solution in water will have the lowest vapour pressure?
Which of the following solution in water will have the lowest vapour pressure?
- A. \( 0.1 M, \) NaCI
- B. \( 0.1 M, \) Sucrose
- C. \( 0.1 M, \)ВаС\( I_{2} \)
- D. \( 0.1 M N a_{3} P O_{4} \)
Step-by-step solution
Vapour pressure lowering depends on the concentration of solute particles. For 0.1 M solutions, the van't Hoff factor (i) determines the effective particle concentration: NaCl (i≈2), sucrose (i=1), BaCl2 (i≈3), Na3PO4 (i≈4). Na3PO4 dissociates into the most ions (4), thus greatest lowering of vapour pressure.
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