Now I'am ready to write the KSP, KSP which we know is the copper

concentration times the hydroxide concentration squared.

We can plugin what we know, KSP is 2.2 times 10 to the minus 20,

and we can put S in for copper and we can put 1 times to the minus 11 and

for the hydroxide and squared.

So the molar solubility would be 2.2 times 10

to the -20 divided by 1.0 times 10 to the -22,

which is what this squared would be, 1 times 10 to the -22.

This would give me a molar solubility of 2.2 times 10,

well negative 20 minus 22 would be to the second power.

Where that would be 220 molar, okay, so let's think about that number.

If we compare it to the others, this is really high, and what we learned is that

adding an acid to an insoluble salt will increase the solubility.

Well, in pure water,

we look up here at this number, this was the molar solubility in pure water.

We can really affect the solubility of an insoluble salt by changing the pH.

Raising the pH to pH of 3 increased the solubility of the salt very much so.