00:01
So today, we're asked some questions about factors affecting solubility.
00:05
So for the first question, we're given two vitamins, vitamin a and vitamin c, and we can see their structures.
00:11
And so we're asked to identify which one will be water -soluble and which one will be fat -soluble.
00:16
Okay, so if we look at the vitamin a molecule, we can see that it is mostly nonpolar.
00:26
And if we look at the vitamin c structure, we can see that it is mostly polar because the vitamin a just has a bunch of these ch chains and the vitamin c molecule has a bunch of these oh polar groups.
00:46
Okay, and so when we look at these structures and we think about solubility, we know that like dissolves like, meaning that a polar substance will dissolve a polar substance and a nonpolar substance will dissolve a nonpolar substance.
01:06
So vitamin a is mostly nonpolar and fat is a nonpolar molecule, meaning that vitamin a is going to be our fat soluble molecule.
01:19
Now, vitamin c is mostly polar, and water is polar.
01:25
So vitamin c is going to be a water -soluble molecule.
01:31
Okay, question two asks us to use the enthalpy of reaction to explain why the solubility of gases decreases as temperature increases.
01:43
Okay, so when we think about gas dissolving, well, when gas dissolves, this process is exothermic.
01:55
This means that it releases heat.
01:57
So as the temperature increases, the system tries to reduce the amount of heat produced, thus resulting in a decrease in the solubility of the gas...