00:01
Let's see here.
00:03
We're given some information.
00:05
Let me write this down first.
00:11
Volume of vinegar each trial, 5 .00 milliliters.
00:32
Malarity of n -a -o -h, each trial is given as 0 .2 -00.
00:53
Those two are given.
00:54
And then our next will be volume of n -a -o -h.
01:11
Trial 1 volume of n -a -o -h in trial 2.
01:24
That'll be 22 .00 or 22 .0 milliliters and 24 .0 milliliters.
01:42
Number five is a calculation and it'll say average volume of n -a -o -h used and that'll be we're told to do this.
02:09
Number three plus number four divided by two.
02:19
That's given.
02:20
So we're going to take 22 .0 milliliters plus 24 .0 millimeters divided by two and that will be 23 milliliters.
02:43
Okay, what do they want in four? malarity of acetic acid in the vinegar.
02:53
This is another calculated answer.
03:17
And here we're we're told to take molarity of acetic acid times the volume of acid are unknown so we're going to um malarity of acetic acid times our volume of acetic acid equals molarity of n aoh times the volume of n -a -o -h.
04:10
So this will equal my molarity of n -a -o -h is 0 .2 -0 -0 -0 -molar times 23 .0 milliliters.
04:57
So the molarity of the cetic acid will be, see if i calculated that already, will equal 0 .2 times 23 divided by 5.
05:18
Whoops see what i do there.
05:22
Point two times 23 divided by 5.
05:25
And this will equal 0 .920 molarity.
05:51
And that's my answer for number six.
05:55
Let's see what number seven has us doing.
06:03
It's another calculation.
06:06
And we're getting molecular weight of our acetic acid.
06:23
And the formula for acetic acid is c -h -3 -c -o -o -h.
06:37
I should have done this one on the next page.
07:10
So i have c -h and o are the elements present.
07:19
You'll see i have two carbons, four hydrogens, and two oxygens.
07:26
I'll multiply these each by the molar mass.
07:33
So i get 24 .02, 4 .0.
07:40
And 32 .00.
07:52
And i get 60 .06.
08:11
And i added to get that.
08:13
So 60 .06 grams per mole.
08:26
And that's my answer for number seven.
08:30
Number eight is another calculation.
08:36
And eight wants me to get grams of acetic acid in 100 milliliters of vinegar.
08:54
And this says to take step, no, i'm in the wrong one...