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Removed trom tne Syslein; (L} 5) The pHofan acid solution is 6.20.Calculate the K, for the acid. Theinitial acid concentration is 0.010 M. colutions containing the ...

Question

Removed trom tne Syslein; (L} 5) The pHofan acid solution is 6.20.Calculate the K, for the acid. Theinitial acid concentration is 0.010 M. colutions containing the following salts: (a) KBr, (b) AI(NO3)3,

removed trom tne Syslein; (L} 5) The pHofan acid solution is 6.20.Calculate the K, for the acid. Theinitial acid concentration is 0.010 M. colutions containing the following salts: (a) KBr, (b) AI(NO3)3,



Answers

Calculate the $K_{\mathrm{a}}$ of the following acids using the given information.
\begin{equation}
\begin{array}{l}{\text { a. } 0.00330 M \text { solution of benzoic acid }\left(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{COOH}\right), \mathrm{pOH}=10.70} \\ {\text { b. } 0.100 M \text { solution of cyanic acid }(\mathrm{HCNO}), \mathrm{pOH}=11.00} \\ {\text { c. } 0.150 \mathrm{M} \text { solution of butanoic acid }\left(\mathrm{C}_{3} \mathrm{H}_{7} \mathrm{COOH}\right), \mathrm{pOH}=11.18}\end{array}
\end{equation}

To calculate K A. We need to know what the hydrogen ion concentration is. K will be equal to the hydrogen ion concentration squared, divided by the acid concentration that produced that hydrogen ion concentration minus the hydrogen ion concentration. Because some of this asset reacted in order to produce the hydrogen ion concentration. So from P. O. H. The objective then is to solve for the hydrogen ion concentration. Because we're given the weak acid concentration, we'll take the P. O. H subtracted from 14 to get PH 3.3 and then raise 10 to the negative 3.3 to get our hydrogen ion concentration of 5.1 times 10 the negative four. And then we plugged the hydrogen ion concentration here into this equation with the weak acid. Ben Zoellick acid concentration at 0.33 and we get a K A value of 8.97 times 10 the negative five for the next one. The P. O. H. Is 11. Subtract that from 14. We could a p h of three raise 10 to the negative three. We get 30.100 That's our hydrogen ion concentration which else? We will square in the numerator and subtract from the weak acid concentration in the denominator, and we get 1.2 times 10 the negative five for the next one. We have a P O. H of 11.18 subtracted from 14. Get a pH of 2.82 then 10 to the negative. 2.82 is 1.51 times 10. The negative three will square that in the numerator and subtracted from the acid concentration of 0.15 in the denominator and get 1.5 times 10 the negative five.

Hello Today we're doing problem 42 from tractor four. So they want the ruler concentration. Who ions? The total Mueller concentration of islands assuming complete association of 0.750 Moeller que Tu Sio three and 30.355 more LCL three. So I left the office. First thing we have to do is write out the decision reaction. So we have k two of you to be plus ions and then we have one CEO threes with one seal the film minus for the charge. So you know that one Que Tu Sio three is gonna make two K plus islands and one c o d minus. So what we have to do is take this concentration, multiply it by two for the kid's clothes ions, and then we're going to add the concentration of woodsy agree to minus. Now, this is a 1 to 1 ratio, So this is just going to be 0.75 and this is going to give us our final answer of 2.25 You know what? And that's how we figure it out for any reaction, you write the association. Well, you don't have to ride it out. You can just after a while envisioning in your head. You know that you have to. Okay, you have. And then you have one seal drinks. So you just plug in Chuck and get your answer. So let's look at the next one. We have a l c. L three. So you know, this is going to associate until one aluminum That's going to be L A L B plus. And then we have three Koreans, so it's three feel minus. Now, the same thing here, you look at the Coalition's so we know that the concentration of ale is gonna be the same as a L C all three. So the 0.355 that with the three fine 0.35 fall, and that is going to give us our final answer of one or two more. So again, just

We have Ah one. Um Mona T. So it's a small m more loudly. See off our, um, core asset asset the mortar. So decision frees us. Ah, minus one point. I have three degrees Celsius. And what would be the k off our car and see the asset? Okay, first, before we have our currency, the assets. So we're going to wait. Ah, as it dissociation reaction equation. So we have a minus us. Ah, How's your the Mayan? So we can cancel the ice table initially. Ah, we should have Ah, one on c 00 Um, Bo, that morality, huh? Small M. But the question also assumed that the mold authorities say master morality. So for this case, we can use mood. All Retty, and you will be excited to say mass our modality, gift and die the questions. So Ah, yeah. You sure? We just set up the I stable. So we have plus plus aches with my six. So one point Suisun last thinks and there were X headaches. And then we can set up our K expression and that we should swim on steel. Seawolves, my six. So it's ah, it's pretty straightforward for the first part. Okay, so the question is, how can refile takes. So we have to look at another drink. Information given to you from Michigan is the freezing point mass 1.90 degrees Celsius. So from here, we have to You are we call us. Ah, freezing point. Depression from the corrugated poverty's. So for the change in the freezing point, you re close to our mother. Oh, you're symbol that. Let's see, um, officially want depression. Constant times The At show Mullah, Let's see off the solution. So ah, to be ah, the concentration. The morality over here. Yes, we percent off the Sobel species off the saw those pieces in a solution. So he doesn't tell you which squeezes, but you tell you the offer or concentration or off their suits. Okay, So if we go into Pu Bassam Ah ah, the value for water. It will be 1.86 Ah, for the constant and and well that it is, are you just don't know. And and ah, different in the temperature should be equals to 1.93 because off normal water, if he's a serial degree. So you were pure water study we But when we de Sol ved decreased to 1.93 So that job every 1.93 So if we're going to solve for, um ah more, more, more content Morality Off the suits with you am over here you were essentially equals to 1.4 Ah, morality. So what does it mean? So here is 1.4 Because he's only tell you I'm understood it. So what do we have in our solution? So we look how are, um I stable? What do we have you now Solution? We have high juliam we have a minus and also we have a che the some off all three chemical species We'll be equals to 1.4 morality And because the question also assumed that the morality and we're already dead essentially the same. So essentially we have one point Old four Ah Moeller for the total concentration off a pass a minus Plus hijo Liam So you re way that itchy purse Ah, a minus. Plus, Hijo de, um, to be close to one point go for so from here we can set up ah equation because we know that hey would be one point. Oh, all my aches and they a will be closed to aches. And also, Hijo de, um also use the aches. And they were 1.4 So far from this equation we can actually solve for X. Okay, so we're going to ah, do some algebra and and we should be able to see that X equals Cecile points You four motor. All right, so we just put union to our you call even expression. So they were changed to call it back. Teoh Black. So you would be a soup on. So, for we have ah super seal Force Square divide Divide by one minus 704 And then we should be able to find it A k is equal to one point. Um six. Sorry. 1.67 Time. 10 to the power of three. And this will be our K for the

For this question. We are given the K. Value for the acid and the concentration of the acid. And were asked to calculate the concentrations of the hydro Nehemiah in and the conjugate base concentration. This is the para amino benzoate ion. To do that. We recognize that K. A. Is equal to the hydro knee um concentration squared divided by the initial concentration of the weak acid minus the hydro knee um concentration. And these two concentrations are equal to each other as we produce one hydro Nehemiah on every time we have the acid be converted into its conjugate base. If we assume that this value is small with respect to the initial h concentration then the hydro knee um concentration rearranging this equation will be equal to the square root of the initial concentration, multiplied by ca giving us a 0.11 moller this is the hydro knee um concentration and also the conjugate base concentration percent ionization is going to be the amount of hydro knee um That we got divided by the initial concentration .055 times 100. And we get two Ph then can be calculated by taking the negative log of the hydro knee um concentration and we get 296


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