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Distribution curves show how the fractions of nonionized acid and its conjugate base vary as a function of $\mathrm{pH}$ of the medium. Plot distribution curves for $\mathrm{CH}_{3} \mathrm{COOH}$ and its conjugate base $\mathrm{CH}_{3} \mathrm{COO}^{-}$ in solution. Your graph should show fraction as the $y$ axis and $\mathrm{pH}$ as the $x$ axis. What are the fractions and $\mathrm{pH}$ at the point where these two curves intersect?

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THE ANSWER IS GRAPH

Chemistry 102

Chapter 16

Acid-Base Equilibria and Solubility Equilibria

Acid-Base Equilibria

Aqueous Equilibria

Rice University

University of Toronto

Lectures

00:41

In chemistry, an ion is an atom or molecule that has a non-zero net electric charge. The name was coined by John Dalton for ions in 1808, and later expanded to include molecules in 1834.

24:14

In chemistry, a buffer is a solution that resists changes in pH. Buffers are used to maintain a stable pH in a solution. Buffers are solutions of a weak acid and its conjugate base or a weak base and its conjugate acid, usually in the form of a salt of the conjugate base or acid. Buffers have the property that a small change in the amount of strong acid or strong base added to them results in a much larger change in pH. The resistance of a buffer solution to pH change is due to the fact that the process of adding acid or base to the solution is slow compared to the rate at which the pH changes. In addition to this buffering action, the inclusion of the conjugate base or acid also slows the process of pH change by the mechanism of the Henderson–Hasselbalch equation. Buffers are most commonly found in aqueous solutions.

05:59

Draw distribution curves f…

03:13

Indicate the identity of p…

02:00

MATHEMATICAL Sketch a titr…

01:44

The graphs labeled (a) and…

Lowe's. Today, we're going to be talking about how to draw a distribution curve. So today we're going to be trying the distribution curve for acetic acid. So the first thing we should do is look at its K A. It's K is ah, 1.8 times 10 to the negative five. So what is its peak? A. While it's P K is the negative log of its K A, which in this case is four 0.74 and a really useful equation Teoh think about while drawing of this distribution curve is the Henderson Hasselbach equation. So the pH is equal to the Pekka a plus the log of the kontic it base over the acid. So when you look at this equation, you'll notice that when the quit, when the concentration of the country get base in, the acid are equal is when the P H is equal to the peak. A. So what does this mean when the concentration of ah, the conjugal base in the acid or equal which is the halfway point? For both of them, they're milliner. Fraction will both be half will be the PKK, which in this case is four point 74 which is so will place the point right here. This is where both curves will intersect. So what exactly is a distribution curve? While it's basically how much of, ah, how much of the acetic acid or the base is present at different pH is so at low ph acetic acid will be protein ated. It will be an acid. So will be like this. So at one at the Ph. One lower than the PKK, the country, the log over a the country get based over the acid has to be one, which means that the well, it has to be negative one. So the concentration of the acid has to be 10 more, 10 times more than the country get base. So that means we'll have 3.74 and sort of this point. So we see and then where the pH is greater than the PKK by one. The log of this has to be one, so that means there's 10 times of the con jacket base instead of the acid. So at like 45.74 we'll have another point. And so we will see that we start off with all of it Co Tinh ated. But as the peach increases, we start to come down and we will taper off it. Zero sort off. Now let's take a look at So the green has was our acetic acid and the blue will be our acetate. So the conjugate base. So let's start a Ph 14. So I ph 14. Everything is deep protein ated. And so at ph 5.74 liquid, it will be 10 times as great as the acid. Then ill interact here across here and then a ph three point 74 the base that the acid will be 10 times as great as the conjugate base. So you see here. So there we go. Essentially. So we see that the point where both of the where deep both of these lines cross is the pH will be the PKK. More fraction will be half because they're equal. Half us 1/2 is a hole. And so we see. When the pH is low, we will have mostly everything protein ated. When the pH is low. When the pH is high, we'll have it mostly the country get base. So there we go

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