00:01
Okay, so for each one here, we'll go ahead and take the information we're given and see if we can fill in the rest of the pieces of the table.
00:08
So for this first one, we know that p -o -h is 8 .14.
00:15
Well, ph plus p -o -h equals 14.
00:23
So if we go ahead and subtract that from 14, we'll get that our ph is 5 .86.
00:32
And then the concentration of h plus is just 10 to the negative ph.
00:40
So 10 to the negative 5 .86.
00:45
And if we do that out, we'll get 1 .4 times 10 of the minus 6 molar h plus.
00:55
And we've got all the pieces there.
00:57
And the last thing we need to do is decide is this acidic or basic.
01:01
Since the ph is less than 7, so this is going to be acidic.
01:08
So the answer to is a basic answer is no.
01:18
So on this next one, we've got the ph given to us is 13 .28.
01:24
So again, we can find the p .o .h by subtracting that from 14.
01:28
So that's going to give us 0 .72.
01:31
And then the h plus concentration is just 10 to negative 13 .2.
01:39
Or a little more sensible math.
01:44
We've got 5 .2 times 10 to minus 14 molar h plus.
01:51
And the oh minus is 10 to the negative .72.
01:59
So we'll get .19 molar oh minus.
02:05
And in this case, our ph is greater than seven.
02:10
So this is basic yes...