00:01
That between the years 2011 and 2021, that the annual average of ph in the northern ontario town dropped from 5 .6 to 4 .3.
00:08
We want to figure out how many times more acidic was the precipitation in 2021 compared to the year 2011.
00:15
Well, looking at your formulas, the most useful formula is going to be our formula for ph, where ph is equal to minus the log of h plus the hydrogen plus ions.
00:26
So in this particular case, what we need to do is find how many hydrogen, ions were in each year.
00:31
So for our first one, i'm going to substitute 5 .6 in for the ph and equal to negative times the log of h plus, or our hydrogen ions.
00:41
Keep in mind that our log here is base 10.
00:43
So in order to solve for our hydrogen ions, first i'm going to divide both sides by a negative 1.
00:50
So that leaves us with negative 5 .6 equal to the log of our hydrogen plus ions.
00:56
Remember, this would be base 10.
00:57
So if we write this in exponential form, that means it'll be 10 to the negative 5 .6 power will equal to the number of hydrogen ions...