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Whal type of titration represented by lhe following Image?14.010.0Volumie of acid addedStrong = Acld = strong buseWeak acid Wcak bateStong acid wejk baseWezk Jid st...

Question

Whal type of titration represented by lhe following Image?14.010.0Volumie of acid addedStrong = Acld = strong buseWeak acid Wcak bateStong acid wejk baseWezk Jid strorg hase

Whal type of titration represented by lhe following Image? 14.0 1 0.0 Volumie of acid added Strong = Acld = strong buse Weak acid Wcak bate Stong acid wejk base Wezk Jid strorg hase



Answers

The titration of a weak acid by a weak base is not a satisfactory procedure because the pH does not increase sharply at the equivalence point. Demonstrate this fact by sketching a titration curve for the neutralization of $10.00 \mathrm{mL}$ of $0.100 \mathrm{M} \mathrm{CH}_{3} \mathrm{COOH}$ with $0.100 \mathrm{M} \mathrm{NH}_{3}$

So we want to sketch the Thai trey shin curve for a week base being tight, traded with a strong acid. Uh, before we add any acid at zero. The pH of that week based solution may be saying that 10 to 11 range, and as we start adding the weak acid, then the pH will start to drop fairly quickly. But then it will decrease much more slowly with a kind of A A shallow, uh, decrease in, uh, pH as we continue to add the asset. And that will go on for a fair volume because the essentially have a buffer solution. Once you have converted a significant amount of the week base by reacting it with the weak acid, for example, again, the ammonia reaction with HCL. Um, as you add the HCL, you're converting the ammonia to the ammonium ion, and so you've got a mixture of the two, and that is a buffer. And so the pH is changing slowly across that range. And then, ah, as you start to approach the uh, equivalents point, then the pH will start to drop off more rapidly and then quite precipitously, quite rapidly. Uh, at at some point, and then, depending on the concentration of the weak acid, eventually you will get to a point where I'm sorry. The strong acid you'll get to a point where the pH that you're measuring, you've neutralized all of the week. Base at the equivalents point, which will be somewhere in the acidic range, maybe around the ph of five or so. That which is what it would be for ammonia. And then the pH will continue to drop sharply. Uh, but then, uh, it will start to level off, uh, and indicating the the pH effect of the strong acid.

Using the titillation curve provided in this question, let's answer the questions that follow. So what substances being tight traded? The substance being tight traded? Mhm is a weak acid. Well, part B were asked to identify the equivalent point. Mhm. And the equivalence point occurs at approximately a ph of 8.3. And for C, what might an indicator to be suitable for this situation? Uh I would choose the indicator. Mhm. Female failing. Yeah. Mhm should be used, yeah. As the indicator for the situation. Yeah. Yeah, mm. As it changes color between ph 72 10.

So when they saw the week bases territory with, um, by strong base, you will end up with acres. So So v a, um would be, like with a strong base in a strong acid. So you will get something that looks like that. So this is for a a strong base with a strong asi Have we compare those 28 iteration curb of a, um, strong base with a weak acid? It looks something along the lines of that. So this goes much further down. The this one will go much further down with all of us here, Whereas this just goes down, it's fallen out.

All right. So for a strong acid, too strong based titrate asian, Um, for the initial pH. Um, let's take a look at what the flask looks like it to being, or beaker as I have drawn, um, inside, we just have the strong acid. And since no strong base has been added yet, um, this will be quite a bit less ellipse will be quite a bit lower than a ph of seven. Okay, um, and for a weak acid, too strong base titrate Asian. We take a look again at the beaker. All that's inside of it right now is a weak acid. And so it would be very, very close to a ph of seven, Um, initially and for a strong acid, two week based titrate Asian. All that we have in here is, um, there's only weak base present in here, so it's very, very close to seven as well and be slightly above seven, but very, very close to seven. So, um, the order for the initial pH is strong acid to a strong base. His lap is lower than less than the weak acid too strong base, which is lower than a strong acid the weak base. Okay, And that's for the initial pH. What Now Go back up and start here with the strong acid. Too strong based iteration for part B. So at the equivalents point, all the acids are neutralized by the added base eso The number of moles of the added uh, add droney, um ions equals the number of moles of Ah, uh, I draw oxide ions h zero plus equals O H minus K at equivalents. Point us of the strong acid too strong based filtration. The solution consists of the an ion of strong acid in the cat ion of strong base, which does not react with water. And this solution is neutral. Since these air equal it is neutral at a pH of seven came. So then for the weak acid too strong base titrate asian. Um, the solution consists of the cat ion of strong base in the an ion of the weak acid. So the strong based cat ion does not react, react with water, the anti on of the weak acid acts as a weak base and accept accepts a proton from water and yields hydroxide. Um, hence this solution is basic at equivalents point. Um, another way to put that is Ah, I'll just say the strong base here. It does not react with water, but the weak acid will, and it produces. Um, I draw oxide because it's a weak ass and so produces to fix that. It produces more hydroxide ions in the water. And so it makes it slightly basic Cain. Now for the strong acid, two week based filtration at equivalents point. Um, the solution consists of the an ion of strong acid and the Canada on of weak base. Strong acid. An ion does not react with water. The cat ion of the week base acts as a weak acid and donates a proton the water and it yields aged three or plus. Okay, so at the equivalent equivalents point, that makes this slightly acidic. Yeah. So that means, um, it goes. The order for this one is strong acid. Weak base is less than strong acid. Too strong base, which is less than the weak acid. Too strong base for the equivalence point.


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