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Peracetic acid has an extra oxygen atom compared to acetic acid. There is a 3.4 pKa unit difference between the two acids. What may account for the higher pKa value...

Question

Peracetic acid has an extra oxygen atom compared to acetic acid. There is a 3.4 pKa unit difference between the two acids. What may account for the higher pKa value for peracetic acid?peracetic acid pKa 8.2acetic acid pKa 4.8OHH;cH3COH

Peracetic acid has an extra oxygen atom compared to acetic acid. There is a 3.4 pKa unit difference between the two acids. What may account for the higher pKa value for peracetic acid? peracetic acid pKa 8.2 acetic acid pKa 4.8 OH H;c H3C OH



Answers

Chloroacetic acid, $\mathrm{HC}_{2} \mathrm{H}_{2} \mathrm{ClO}_{2},$ has a greater acid strength than acetic acid, because the electronegative chlorine atom pulls electrons away from the $\mathrm{O}-\mathrm{H}$ bond and thus weakens it. Calculate the hydronium-ion concentration and the $\mathrm{pH}$ of a $0.0020 \mathrm{M}$ solution of chloroacetic acid. $K$ is $1.3 \times 10^{-3}$

So the acetic acid has the following lewis dot structure H three C. Single bond carbon double bond, oxygen, oh. H. And so we can see that one carbon oxygen bond is a single bond and one carbon extreme bond is a double bond, so they will have different bond lengths. Whereas with the aesthetic acid iron we lose a hydrogen from the alcohol group. So we lose this hydrogen here. So what we have is H3 sea single bond carbon double bond oxygen, single bond oxygen with a negative charge. And so what we have is resonance that is present. And this has an averaging effect. And so what we actually get is an average of the two bond lengths together, which makes the bond lengths the same.

Yeah. In this question 0.1 Mueller plurality as if solution is given and his speeches given us 1.96 We have to calculate the K. A. And BK of this asset. Now ph is given as 1.96 Therefore ph means negative law hydrogen in concentration which is 1.96 Therefore hydrogen in concentration is tend to be poor negative 1.96 Therefore concentration of H plus and minus 0.11 Now let's write the ionization reaction. Uh laura a city cassie eight C two H 202 cl plus water. Yeah. Yeah C two H 202 Cl miners plus. Is to you plus mm I think I like this one dog plus face trio plus in a solution. Now let's make the ice double here. Yeah, here initial concentration is 0.1 Mueller gino gino since concentration minus six plus six plus six. And the equilibrium concentration is 0.1 minus six. It's it's now we'll write the expression for A. A. K. A. Is concentration of C. Two H 202 Seal minus times concentration of a studio plus divided by the concentration of the acid. Yeah now concentration of this one and this one is X times six. X squared divided by 0.1 minus is now here exist concentration of high dona maya. That is equal to concentration of the low acidity ir with just 0.11 So less right X square means 0.11 square divided by 0.1 minus 0.0 point 011 So to the 0.11 square divided by 0.89 And the value for K. A's therefore K. A. Of this S. It is 1.4 times 10 to the power negative three. Therefore PK will be negative Law K. A. That means negative law 1.4 times 10 to depart negative three. And the value for P k. A is there are four quickie in you is 2.8 five. So this is the value for p K. And this is the value for K. For claro acetic acid. Mhm.

Answer for the question Yeah. Ascetic acid is vigor as it then? Nitrous acid. Uh huh. How do the strength of the basis see to history or negative end and a negative compares. So here we have. Let's see. Two S three or 2. Yes. Wicker is it? This is a static, as it is Vigor, is it? And age can you get best? Will be strong. Can you get base here East C two S three or negative? So say weak, weak acid always produced it wrong. Can you get this? And eight and 3 nitric acid is stronger as it And apes. Can you get this? Can you get best? We have and or negative will be weaker. So a strong as it always produce. We can you get the best?

In this problem were given the K's of two different assets acetic acid here on the left and ah, hypo Cloris Acid here on the right and were asked to compare the basis city of their congregate basis. And so, in our chances question, you seem to know, in fact, that be stronger. The at and acid is a weaker it's congregate basis. And so, since we're asked to find the base that is stronger, the country based that stronger, we need to determine first which acid is weaker. And since we're giving the case, this is a really easy question. We have 1.8 times 10 to the negative fifth for acetic acid versus 3.5 times sensitive eighth negative. Eighth is smaller than negative fifth, so Cielo minus is going to be the conjugal base of the weaker acid and thus the stronger base. And that's the answer


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