This video shows how a titration curve is constructed using data from the titration of a strong acid with a strong base. It also summarizes some of the important features of this Strong Acid-Strong Base titration curve.
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0:00done a day duration curve is a graph which shows how the pH have an acid
0:05solution changes
0:07as a base is added to it for how the pH the base illusion changes
0:11as an acid is added to it here will consider the addition
0:15have a strong base to a solution which is initially
0:18a strong acid
0:20the base is in the beer at and yes it is in the beaker below it
0:24strong base we use in our example is .1 mall there
0:28any await
0:29and a strong asset values his point one molar HCl
0:33we have added twenty five milliliters appoint one molar HCl to the beaker
0:39a pH meter will be used to monitor the pH of the mixture in the beaker below
0:43the beer at
0:45what we'll do is drug wrap up the pH in the beaker
0:49verses the volume a penny awaits added to the HCL
0:52in a beaker
0:54we'll start with the PHP for any oooh
0:57is added at all
0:59at this point we have zero malls have any awaits President
1:02and twenty five milliliters their point zero to five leaders
1:06times point one mole per liter he goes point 0025 malls
1:11at HCL
1:13because all we have in the beakers point my mother HCl
1:16I'd only mine concentration is .1 molar
1:21and the pH is equal to 1
1:24now will open the stopcock and slowly at 10 Miller leaders have any oooh to be
1:29cared
1:29watch what happens to the pH
1:38as a result the batting ken Miller leaders have any wage
1:41the pH rose to 1.37
1:44it can be shown that when ten milliliters 0.1 molar any wage
1:48is added to twenty five milliliters appoint one mother HCl
1:52that we've added point 001 moles NaOH 2.00 25 moles
1:58at HCL
2:00so the acid HCl is in excess
2:04this explains why the pH is still quite low at this point
2:08now will add more anyways did a beaker in till we get to a volume
2:1224 Miller leaders have any way each added
2:16watch what happens to the pH
2:25EPA to 24
2:27years has gone up to 2.69
2:30notice it is starting to increase at a faster rate
2:34calculations show that we've now added point 002 for moles NaOH 2.00 25 moles
2:41HCl
2:43the acid is still in excess but not by as much as it was before
2:48therefore the pH is higher
2:51now will slowly add just one more milliliter Neoh
2:54to give us a total of twenty five milliliters attenuates at it
2:59notice how quickly the pH rises here
3:08the pH at this point is gone
3:09all the way up to seven
3:12remember if we assume that we're at 25 degrees
3:15a pH of 7 means dissolution is now neutral
3:20this is a special point in this state region it's called the equipment point
3:25at equivalence point we added twenty five milliliters
3:28our point zero to five leaders 0.1 molar Neoh
3:33which is point 0025 malls 2.00 25 moles HCl
3:39the equivalence point is defined as the point at which just enough babies
3:43is added to neutralize all of the assets
3:46the anyway H&H the outlook completely react with each other
3:50with no access the the reactant
3:55the court
3:56the balanced equation are all one so we see that point 0025 moles
4:00the salt NaCl is formed in this neutralize Asian
4:05like all salts formed from the neutralization have a strong ass a bit
4:09too strong bays
4:10NaCl is a neutral salt
4:13at equivalence point there is no strong base
4:16are strong acid remaining
4:19all other is present is water and in neutral salt
4:23and that's why the pH at the equivalence point a ball strong acid strong Bay
4:27State rations
4:28is seven
4:31after the equivalence point will slowly add just one more milliliter
4:35have any a wage to give us a total of twenty six milliliters
4:38have any wage at it
4:40notice how quickly the pH increases here
4:48notice that went from seven
4:50in all the way up to 11.29 with the addition of just one male
4:54have any wage
4:56you can see that small changes in the volume again you wage
4:59make big changes in pH when we're close to the equipment's point
5:05at the 26 Miller leader Mark we at that point 0026 moles NaOH 2.00 25 moles HCl
5:14so the base NaOH is now an access
5:17therefore the pH is above seven
Негізгі бет WCLN - Strong Acid-Strong Base Titration Curves - Chemistry
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