00:01
For your question, it says, in the laboratory, a general chemistry student measured the ph of a 0 .596 molar aqueous solution of c2h5 2nh to be 12 .458 molar.
00:28
Use the information to determine the kb.
00:31
So the first thing that we want to do is we want to write out the hydrolysis reaction for the diethylamine.
00:41
So we're going to take c2h5 2nh plus h2o.
00:50
And since we're going to write a kb, we know that we have to be making hydroxide.
00:56
So that means that the c2h5 2 nh has to be a proton acceptor.
01:05
So we're going to see that as c2h5 2 nh2 positive plus oh minus.
01:17
And we know that the initial concentration was 0 .596 molar.
01:24
So if we turn that into an ice diagram, i know that we started with 0, 0, and it's going to go to the right, so it's going to be minus x, plus x, and plus x.
01:39
So this is going to give me 0 .596 minus x, x, and x.
01:47
And one of the things i want you to notice is that x is equal to the concentration of hydroxide.
01:53
Side...