00:03
This is a potassium hydrogen thallate problem, and we know the potassium hydrogen thallate is a monoproduct acid.
00:29
Thalate is a monoprotic acid.
00:41
It's often written as khp.
00:44
How many grams of there, how many grams is often written of khp are needed to exactly neutralize? 20 .6 milliliters of 0 .372 molar k -o -h.
01:39
Okay, so this is easy here.
01:44
We've got 2 .0 .6 milliliters of k -o -h.
01:51
K -o -h.
01:57
Let's go ahead and convert our milliliters to liters and multiply that by our molarity.
02:11
Keep running to write an a -o -h, k -o -h per liter of k -o -h.
02:19
This is a monoprotech acid, and k -o -h has one hydroxide, so we know that we've got a one -to -one mole ratio of k -o -h to potassium hydrogen thallate.
02:37
And the molar mass for potassium hydrogen -thallate is 204 -something.
02:42
Let me get to a molar mass tab, which i just opened up.
02:49
We move over here and get my molar mass, potassium hydrogen thallate.
02:58
It's 204 .2.
03:04
Grams of khp per mole of khp.
03:11
This will equal, let me do my math.
03:15
0 .2 .6 times 0 .372 times 204 .22.
03:23
To enter.
03:27
And i will need 1 .565.
03:39
And to three sig figs, we will need 1 .56 grams of k -hp.
03:56
Now we've got another piece of this question here, so i'm going to slide down over here, and switch pencils for pen colors for b.
04:04
Khp is a solid used the auditory standardized not written khp what volume of 349 molar it says 349 molar what? naoh is needed to exactly neutralize 2 .29 grams of kh and i'm going to say maybe i think that they must mean 0 .349 because this doesn't make any sense right here.
05:30
So i'm going to use zero that number.
05:34
2 .29 grams of khp.
05:47
And we'll first convert our grams to moles using the same molar mass we used in the previous problem.
06:00
This is still monoprotic.
06:03
This time i'll have one mole of n -a -o -h to k -h.
06:12
And my question is, this is this this is the number that i'm not real sure of.
06:16
I'm going to maybe go 0 .349 moles per liter.
06:25
And my question was, what volume? and then i'm going to go to 1 liter is 1 ,000 milliliters.
06:46
And i wish i could find this somewhere else, but i don't even know where to look.
06:51
Hang on for a second while i go searching around for a couple of things...