a group of students in a laboratory performing experience on the effect of addin

Question

a group of students in a laboratory performing experience on the effect of adding salt to water. Which observation are students likely to make as they increased the molality by 1m of the salt water to the solution
a. there's a corresponding decrease of 1.86 Celsius in the solutions freezing point
b. there's a corresponding increase of 1.86 Celsius in the solutions freezing point
c. there's no observable change in the solutions freezing point
d. there's initial decrease of 1.86 Celsius followed by an increase of 1.8 Celsius in the solutions freezing point

Explanation / Answer

Kf of water = 1.86 degree Kg/molal

When we add salt to water, there will be decrease in freezing point, given by:

delta Tf = Kf* mb

    =1.86 * 1

    = 1.86 degree celsisus

so Answer is:

a. there's a corresponding decrease of 1.86 Celsius in the solutions freezing point

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