38
QuizMultiple Choice

Colligative Properties — Quiz

Question 38 • Chemistry

If you make a solution by dissolving 1 point 0 mol of FeCl sub 3 into 1 point 0 kilograms of water, how would the osmotic pressure of this solution compare with the osmotic pressure of a solution that is made from 1 point 0 mol of glucose in 1 point 0 kilograms of water?

Answer
A
twice as large
B
four times as large
C
the same
D
one-half as large

Explanation

Osmotic pressure depends on the concentration of dissolved particles. FeCl₃ dissociates into 1 Fe³⁺ ion and 3 Cl⁻ ions, producing about 4 particles per formula unit, while glucose stays as 1 particle per molecule. With the same amount of solute and water, the FeCl₃ solution has about four times as many particles, so its osmotic pressure is four times as large, assuming complete dissociation.

AI-written and checked against the verified answer.

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