00:01
Alright, so for the first question, it's labeled c.
00:03
We're told that the concentration of hydroxide, oh-, is equal to 7 .74 times 10 to the negative 10th molar.
00:14
We want to know the ph and the poh.
00:17
So first, we can take the poh because that's the negative log of the hydroxide concentration, which we already have.
00:25
So we'll just take negative log of 7 .74 times 10 to the negative 10th.
00:35
So that's 9 .11.
00:45
Ph is then 14 minus the poh value because they always add up to 14.
00:53
14 minus 9 .11 is equal to 4 .89.
01:04
So this ph is less than 7.
01:06
So that means that the solution is acidic...
