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In the figures are the titration curves of two amino acids.Consider the first titration.Select the p𝐾apKa values of each functional groupobserved on the titr...

Question

In the figures are the titration curves of two amino acids.Consider the first titration.Select the p𝐾apKa values of each functional groupobserved on the titration curve.71541136921012Identify which amino acid is being titrated.asparaginelysineargininehistidineConsider the second titration.Select the p𝐾apKa values of each functional groupobserved on the titration curve.29761031511412Identify which amino acid is being titrated.histidineaspartatealanineasparagine

In the figures are the titration curves of two amino acids. Consider the first titration. Select the p𝐾apKa values of each functional group observed on the titration curve. 7 1 5 4 11 3 6 9 2 10 12 Identify which amino acid is being titrated. asparagine lysine arginine histidine Consider the second titration. Select the p𝐾apKa values of each functional group observed on the titration curve. 2 9 7 6 10 3 1 5 11 4 12 Identify which amino acid is being titrated. histidine aspartate alanine asparagine



Answers

The graphs labeled (a) and (b) show the titration curves for two equal-volume samples of monoprotic acids, one weak and one strong. Both titrations were carried out with the same concentration of strong base.$$ \begin{array}{l}{\text { (i) What is the approximate pH at the equivalence point of }} \\ {\text { each curve? }} \\ {\text { (ii) Which graph corresponds to the titration of the }} \\ {\text { strong acid and which one to the titration of the weak }} \\ {\text { acid? }}\end{array}$$

Or probable 11. They're asking us to draw filtration curve of Sistine with the PK A values and asking what at what Ph does the existing have no net charge. So here, John Sistine the structure at a low pH. And I don't out the PK a values for each of the groups. And so to draw a filtration curve, we kind of go off with these PK A values are So you see that one point 71 is our first value, suitably pretty low that's here. And then the next one is 8.33 on our next one is 10.70. So to draw the curve, we want to start up like Don't here on the Make that. So that's the title Asian curve for Sistine on DSO. Then the next question is, at what Ph does assisting have known at charge? So if you remember known, that charge means you're looking for the ice to electric point and that equation is PK one plus PK two divided by two. And so if you look up here at this molecule for 16 the amino group has a positive charge. That means they're all needs to be one hydrogen removed to get a neutral amino acid. So we want to do 1.71 and 8.33 would be our PKK's that we would choose. So he would say pH equals 1.71 plus 8.33 guarded by two, and that gives you 5.0 to

So now we'LL work on problems sixty two from chapter seventeen This problem were given two Titra Asian curves for titrate shin of a week and a strong base against the same concentration of strong acid and were asked to ah answer some questions. So first I'll tryto reproduce them accurately here so I can show Well so next we have volume of acid and life We have P h, of course zero, seven and fourteen. So our curve here looks starts up high gradually, gradually decreasing and sharply decreasing in the love line off not perfectly reproduced but that's roughly what it looks like Now if we look at the second one, we have the same axes and here we started a little bit lower of a pH. We drop a little bit when we go down, down, down, down and then we drop quickly, earlier, faster and level off doesn't go quite that long. So the questions are to questions number one, what is the approximate ph of the equivalence point? So the equivalents point we're looking at about half and the this card from, like here to hear about halfway in the middle. And so if we If we go in looking about halfway, it's roughly seven. So pH is equal to seven and equivalence now for this one here, we're going about halfway from the top toe where it levels off. So roughly about here. So it takes some interpretation that's drawn better with a larger scale in the book. But we can say it's approximately five and equivalents, Okay, And then for the second part, it's asking us about the identity of the bases. So which could federation curve corresponds to the tight rations with strong base in which, to the Thai tray shin of the weak base. So since we have appear, we have ah, higher initial ph for this one. We have this sharp drop here and sorry, and then we have. And what more sharp drop. So this one here looks like more like a strong, strong based filtration curve. And then if we look at the second graf b, we can see that this pH here starts lower, and we have a lot of smaller descent here. So there's also confirms what we think that this is the week base

My name is on this question. We will draw the electrician car for die protic acid with a strong base. Example for Dai brought Take acid with the strong bees is carbonic acid iteration. We sold you mind Drop science and the fourth dry Protic as it were strong lease. We will speak about their phosphoric acid with the sodium hydroxide. So when we draw year that hydration curve off The strong days added We found that when we grow it become like zehs the first equivalent then become like sis then the second web along like zits. So here, when we try to know what each species present we have year toe equivalent point the first equivalent point or care we're on. Lee is a biker bunny species prison and the second, the equivalent we carbon eat on the present And the answer is middle, which is 1/2 in the boy. We found that the species present our carbonic acid equivalent to or similar momento boy Kirk, me And here we can calculate the B h Werther's the be ej is equal beak a wrong. Also here at this point, we found the species prisons are point complete and Carboni and the boss ABS images that seem concentration so we can write to your concentration all sweet and weak airlines. You have the same alone concentration, and here we can't get clean. Be EJ. Where's the B edge is equal. Bake a a two, which in the acidity corner system for the second step. Similar when we try to draw the penetration. Kurt for dry protea, Wait can on Lee d bag there first. Two. In the point. We can t take this assert in the boy, which is the first in the boy exists Zach's species H two B or form negative and in the second in the buoyant exists H B 04 Negatives, too, and we cannot detect is a certain one. That year. That edge is equal. Beaky Imam, which is also buffer area. And here the B H is equal Peek a toe, which also it's a buffer area and at this point, the middle. The concentration off the phosphoric equals a concentration auf die hide regime for speed, and at this point of concentration on the hind regime for speed, he's evil. The concentration off hydrogen for screen. Hey,

So in this video we're going to be answering questions. 64 from Chapter 17 which is the grafts labeled A and B showed the Thai trey shin curves for two equal volume samples of bases one week and one straw. Both penetrations were carried out with the same concentration of strong acid. So we don't have to worry about differences in the solutions that we're using to do that. Do the Thai tradition. We're just based in a strong base. Eso The first question we asked is what is the approximate ph of the equivalence point of each curve? So just eyeballing this we look at the tape creation curve and a and it looks like the equivalence point Is that a ph of about seven? So we have a neutral equivalence point. Where is if we look at the tie Trey shin proven be? It looks like the of Lynn's point occurs around a ph of five s. So we have a slightly acidic equivalence point and b, The next question were asked, is witchcraft corresponds to the decoration of a strong days and which one to the weak base? Um, so we can actually use our answer to the last question to answer this question, eh? So we know that as we're adding that strong acid, we neutralized the base and we formed the constant acid so that the equivalence point we have a certain concentration of the conjugal acid present. When we're tight trading a strong ass, we're We're tight trading a weak case with a strong acid. Um, so this is going to make me a couple of points slightly acidic. So we have a slightly acidic equivalence point and B and a neutral equivalence point A. So the temptation gruban be must be for a week base, whereas the citation crude and A is for our strong base.


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