Compared to a 2.0 M aqueous solution of NaCl at 1 atmosphere, a 3.0 M aqueous solution of NaCl at 1 atmosphere has a

(1) lower boiling point and a higher freezing point

(2) lower boiling point and a lower freezing point

(3) higher boiling point and a higher freezing point

(4) higher boiling point and a lower freezing point

Question

30-05-2016
Chemistry

Answered

Compared to a 2.0 M aqueous solution of NaCl at 1 atmosphere, a 3.0 M aqueous solution of NaCl at 1 atmosphere has a

(1) lower boiling point and a higher freezing point

(2) lower boiling point and a lower freezing point

(3) higher boiling point and a higher freezing point

(4) higher boiling point and a lower freezing point

Verified Answer :

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taskmasters taskmasters · Answer 1 · 2016-06-04T06:16:16-04:00

The correct answer is option 4. A 3.0 M aqueous solution of NaCl has a higher boiling point and a lower freezing point than a 2.0 M aqueous solution of NaCl where both are at 1 atmosphere. This is explained by the colligative properties of solutions. For the two properties mentioned, the equation for the calculation of the depression and the elevation is expressed as: ΔT = -Km and ΔT = Km, respectively. As we can see, concentration and the change in the property has a direct relationship.