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The pH of a 1.3 M solution of 4-pyridinecarboxylic acid (HC 6H_NO2) is measured to be 2.42Calculate the acid dissociation constant Ka of 4-pyridinecarboxylic acid. ...

Question

The pH of a 1.3 M solution of 4-pyridinecarboxylic acid (HC 6H_NO2) is measured to be 2.42Calculate the acid dissociation constant Ka of 4-pyridinecarboxylic acid. Round your answer to 2 significant digits.

The pH of a 1.3 M solution of 4-pyridinecarboxylic acid (HC 6H_NO2) is measured to be 2.42 Calculate the acid dissociation constant Ka of 4-pyridinecarboxylic acid. Round your answer to 2 significant digits.



Answers

A $0.015-M$ solution of cyanic acid has a pH of 2.67 . Calculate the ionization constant, $K_{2}$, of the acid.

In this question There is a 0.015 molar solution of sonic acid and which has a ph of 2.67. We have to calculate the organization constant K. A. For that acid. Now ph given is 2.67. Ph means negative law had a near my own concentration Which is is equal to 2.67. So concentration of high Dooney. Um iron is 10 to the power negative 2.67 and that is 2.14 times 10 to the bar -3 Moeller. Now that's right. The ionization equation for the acid. H. O. C. N. Yeah plus water. Yeah and C. O minus ion plus a studio plus Let's make the ice table here. Initial concentrations you do 15 00 change concentration minus six plus six plus six equilibrium concentration. 0.15 minus X. X. X. Now let's write that expression for K. P. KB. Is concentration of N. C. O minus times. Is theo plus divided by concentration of Hc en. Now in C O minus is X concentration of a studio plus also eggs. And this 10.15 minus X. Now exes concentration of high Dona man. Which we have calculated hair. 2.14 10 to the power minus three. So KB is X. Square means 2.14 times to into the bore negative three Square divided by 0.015 minus zero point 002 14. Now If I subtract this one The value is 0.01286, And it is 2.14 times 2.1, 4 times 10 to the Power -6. And the fellow for KB Yes, 3.5 times 10 to the bar -4. Sorry, it is not. Maybe it will be a k a, k a, Abdeh acid. So it is K A. Okay, And G E. So the key A A cd immunization constant for the S e d s 3.5 times 10 to the power negative four.

With a problem. 45 40 fungus on it. Chances. What if I We have Sonic positive, right? This has it. The show, Shane water and leave us sign night I am And hydro neo Mayan. This How close now, Chris. And you have to you the I see table in your soul Jing and a really um and the Cabinet room we have fully 015 hands This Nothing. My zero this after does we have minus us and lost that here? I'm last in the end, boy. 01 fly minus As you I stayed less space people The concentration of hydro new Mayan And we know Bs All readies We know bs We have us. Hey, school, right? So soapy, Go 10. Name that D boy 67 Because we have B s equal. No de lock off this one. Right? So we can go, ladies and we do have That's cool. Two boy One for time, 10 to 3. And now we have the constant off we have we have the And now we have to calculate the equilibrium. Right? And now we get as already. So we just subjecting the question we conduct We have K vehicle. This all of them here. They could be quickly, really more so. We have a square divided boy. 01 fight minor Esquire. And we know that's already so we separate you. So we have do, boy one full tie. It's good. Your body is who? And you saw the problem with Spider contents. Three boy five. Well, well, my nobility.

It 0.15 Mueller Solution of hydrogen sign It has a pH of 2.67 for a What is the hydro knee? Um, Iron concentration Leach 30 plus would be equal the 10 to the minus. Ph 10 to the minus. The PHS 2.67 It's therefore the joining my in concentration would be equal to 2.1 times 10 to the negative. Three Mueller for B What is the k A start with h o C N at age to a whole s a weak acid each 30 plus and O C and minus. Initially, we have 00.15 Mueller, we're going to create a nice table here. The pH, we found was 2.1 times 10 to the negative three plus 2.1 times 10 to the negative. +300 initially, plus 2.1 times 10 to the negative. 32.1 times three minus 2.1 times 10 to the negative three. Also be equal to zero 13 que a would be equal to H 30 plus O C and minus over H o C N Yeah. 2.1 times 10 to the negative. Three. 2.1 times, 10 to the negative. Three 013 Let's all for the K A. Here we find that the K A would be equal to 3.4 times 10 to the negative four.

So the pH of the solution is three point to night. So from Ph, you could calculate the proton because calculating the proton concentration, which is tend to the night there's three points too high, equals five point one three times ten to the negative. Forthe Moller. And we know that Kay is age three o plus concentration times a minus concentration divided by H. A. And we could use the approximation this case in a top this three h real plus equals a milers equals the same number. So he used five for one one three times ten to the negative fourth square divided by the A J concentration, which is point one one five more and we've got a value is two point tonight times turn to the nectar of six.


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