00:01
Let's do this chemistry problem about a sudden basis.
00:04
But before i get started, i recommend that you pause the video, do the question of yourselves, and come back to see if you got it right or not.
00:10
So we want to find the ph, right? the h of a solution at different concentrations.
00:21
So we're given three different concentrations and you want to find the ph, right? so it asks, in which cases can you not make the assumption that x is small? well, for that we would need the k .a for hf.
00:37
And the k .a.
00:39
I'm online anywhere.
00:45
So for all of the cases, we can't make the assumption that x is small.
00:52
Usually when we can make the assumption that is small, it's when the k .a.
00:56
Is like times 10 to the bar, minus 5, right? or more.
01:03
And this is because if you do one, 1 minus, right? it would be 0 .1.
01:26
So this value would end up rounding to 1 anyway, so it doesn't really have an impact.
01:30
So we cannot assume we're getting small, right? now that we've hopefully understood why we cannot have an assumption that x is too small, let's get started with the problem...