# If I cool a solution containing 62 g of ethylene glycol in 250 g water to -9.3 °C, what mass of ice will separate out?

##### 1 Answer

#### Answer:

The amount of ice that will separate out is 50 g.

#### Explanation:

The formula for freezing point depression

#color(blue)(bar(ul(|color(white)(a/a)ΔT_text(f) = iK_text(f)bcolor(white)(a/a)|)))" "#

where

We can rearrange this expression to get

#b = (ΔT_text(f))/(iK_text(f)#

In this problem,

∴

So, the allowed amount of water is

You started with 250 g of water, so the other 50 g must be present as ice.