00:01
Okay, so we're going to look at some k values for some reactions between some weak acids and a strong base hydroxide.
00:10
So in the first one, we have this complex ion of iron three is going to react with hydroxide.
00:23
So we're going to pull one of the hs off one of the waters.
00:27
So we'll now have five waters and an oh, and it's charged.
00:33
Is down to 2 plus, and that h plus will add on to the hydroxide and make water.
00:40
I assume everything is aqueous unless otherwise indicated.
00:44
So if we take a look at the reverse reaction, right, we've got this weak base reacting with water and ionizing.
00:51
So the reverse reaction, it would just be the kb expression.
00:55
So the k for the reaction is written is just going to be one over the kb for this weak base right here.
01:04
So if we look that up, that's going to be 1 over 1 .5 times 10 to the negative 12.
01:13
So k for this is 6 .7 times 10 to the 11th.
01:19
So the reverse reaction would be the kb expression.
01:23
So the forward reaction is just the inverse of that.
01:27
In the second example, we're taking some bicarbonate...