Question

A chemist makes a solution of 1.33 mol cacl2 and 800 kg water, and then discovers that the freezing point of the solution is significantly less than 0°c. how could the chemist change the solution to increase the freezing point?

Answer 1

The answer is add 200 kg of water to the solution, like the below answer states, and is also correct, none of the options provided in the question are " Reduce the amount of CaCl2", so you have to balance it out and add more water.

Think of it like this-

In the middle of winter, if you set a small cup of water out, it will freeze very quickly.

A pond however, will freeze alot slower because there's more water.

Hope this helped!

Answer 2

The chemist could reduce the amount of CaCl2 dissolved in the water and thus reduce the freezing point. The reason is that water freezes at 0 degrees C so if the solution is less than 0 degrees C then to approach the 0 degrees C again, the CaCl2 needs to be reduced.