Ammonia is added to water to make Windex. Which of the following Colligative pro

Question

Ammonia is added to water to make Windex. Which of the following Colligative properties are observed?

a) The vapor pressure of the ammonia solution is higher than pure water.

            b) The boiling temperature of the ammonia solution is higher than pure water.

            c) The freezing temperature of the ammonia solution is higher than pure water.

            d) The osmotic pressure of the ammonia solution is less than pure water.

            e) All of these properties are observed.

The answer is B, but I was wondering why the answer is B?

Explanation / Answer

a)

because of the interactions between solute and the solvent

the vapor pressure of the solvent will be reduced

so

vapor pressure of the solution will be lower than the pure solvent ( in this case , water)

b)

we know that

higher the vapor pressure , lower the boiling point

in this

vapor pressure is lowered , so the boiling point in increased

so

by adding a solute , the boiling point of the solution is increased

the increase is given by

dTb = Kb x m

c)

similarly

by adding a solute , the freezing point of the solution is decreased

it is given by

dTf = Kf x m

d)

the osmotic pressure of ammonia solution will be higher than pure water

So

the answer is B

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