00:01
So in this question here, we've got hn02, h2o, equilibrium with h30 plus, n02 minus.
00:19
That's a nice table here.
00:23
And this is 0 .370 minus x plus x plus x, plus x, 0 .37, minus x, x and x.
00:37
So there's our completed ice table.
00:42
Then we'll set up our ka expression here.
00:46
Ka is equal to h3o plus, n02 minus hno2.
00:56
And we're given the kan in this question here, which is 4 .5 times 10 to the minus 4.
01:07
That's equal to x.
01:10
Times x over 0 .37 minus x.
01:15
We do get a quadratic equation here.
01:18
And i'm going to plug this into my equation...