WCLN - Strong Acid-Strong Base Titration Curves - Chemistry

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. http://www.BCLearningNetwork.com. 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