00:01
A buffer is a solution formed from the combination of a weak acid or a weak base and its salt.
00:07
For a weak acid and salt combination, the ph of the solution can be solved using the henderson -hasselback equation, which is of the form ph equals pca plus log of the ratio of the concentration of the salt to the concentration of the weak acid, that's w -acid.
00:27
In this problem, we're given with a solution formed from the combination of 0 .1 molar of h .c7h02.
00:43
So this is a, this is, this is benzoic acid which is a weak acid.
00:51
So benzobic acid and again this is a weak acid.
00:59
It is in combination with its salt which is sodium benzoyate that has a concentration of 0 .3 molar.
01:06
So 0 .3 molar of sodium benzowate.
01:13
So this is the salt.
01:14
So by the way, aside from that, the volumes of these solutions are given.
01:20
So for the acid, we have 300ml...