00:01
To know how changes affect the molar solubility, using le chate liaise principle, we need to be able to write the chemical reaction for the solubility of silver carbonate.
00:18
So that's simply silver carbonate solid separates into 2 ag plus co3 to minus.
00:34
So for part a, it asks what happens if we, why does the molar solubility decrease with the addition of silver nitrate? but with the addition of silver nitrate, we are increasing the silver concentration, shifting this to the left.
01:02
As it shifts to the left, we get decreased molar solubility.
01:07
Then when we increase the acid concentration, if we increase hno3, we recognize this is a strong acid, which can react with the carbonate, which is a weak base.
01:25
As it reacts with the carbonate, its concentration decreases, allowing more of the solid to dissolve.
01:33
So this is going to shift to the right, thus increasing molar solubility.
01:40
Why then does molar solubility decrease with the addition of sodium carbonate? well, if we increase the carbonate concentration, it shifts to the left, and as it shifts to the left, we have more solid, and we have less of the solid dissolved, so we've decreased molar solubility.
01:58
Why does it increase with the addition of ammonia? the best explanation of this, which is a little bit complicated, is we are making the solution more basic.
02:12
If we are making the solution more basic, then it becomes more difficult for the carbonate to exist...