00:01
We've got a table that looks something like this, where we know the formula of the acid nh4 +, and we know its ka value of 5 .6 times 10 to the negative 10.
00:17
To determine the formula of the base, we remove one hydrogen ion, so we remove a hydrogen atom and a plus charge, leaving us with nh3.
00:27
Because ka times kb equals kw, then 1 to the negative 14 divided by 5 .6 to the negative 10 gives us the ka value 7 .1 .78 or 1 .8 to just two significant figures times 10 to the negative 5.
00:57
For the next one, we know the base formula, clo-, and it's kb at 3 .3 times 10 to the negative 7.
01:08
So now we're going to add on a hydrogen ion to get hclo, and ka will be kw, 1 times 10 to the negative 14, divided by 3 .3 times 10 to the negative 7 and we get 3 .0 times 10 to the negative 8...