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Discussion:Whatis the pK ofyour weak acid based on the pH of the half-neutralized solution? How does this value compare to the one calculated above?If the endpoint ...

Question

Discussion:Whatis the pK ofyour weak acid based on the pH of the half-neutralized solution? How does this value compare to the one calculated above?If the endpoint ofyour titration were 0.10 mL past the equivalence polnt; what would the percent error be for the volume measurement? Would the percent error for the molar mass be the same or different? Explain and/or show calculations to support your answer:

Discussion: Whatis the pK ofyour weak acid based on the pH of the half-neutralized solution? How does this value compare to the one calculated above? If the endpoint ofyour titration were 0.10 mL past the equivalence polnt; what would the percent error be for the volume measurement? Would the percent error for the molar mass be the same or different? Explain and/or show calculations to support your answer:



Answers

The $\mathrm{pH}$ of a solution of a strong monoprotic acid is lower than the pH of an equal concentration of a weak monoprotic acid, yet equal volumes of both require the same volume of basic titrant to reach the equivalence point. Explain why.

Everyone. My name is Molly. No one would answer the question. The citation off poulet roti Cassidy was sufficiently the front chickadees, Billy toe equivalent point. So answer this question. We must take example, which is hs three b 04 Indict Duration off H s, three b Off or we will see is that existence, for example, to combat it, you see, before it's just three B or four when we make penetration with sodium hydroxide in a 08 If we follow the citation grant and store old compound exists before we adding any volume in a duet All compound exists. R H is three d before, but when we end in which one draw it convert hs three before to sodium Hi Rosine for Sophie. And if we eat another drop it converted Just rito sodium hydrogen for Sophie Now the conical not contain hs three. Before Why it contains sodium. The hydrogen for Sophie This compound. If we follow the penetration, it's a B age is here is higher. So now when we answer, do my drugs sign A. The way. Evelyn. Buoyant change first time. So it has. It's called the first quiver, but what if we add sodium hydroxide again, is this combined converted toe to sodium and high regime for sphere. Also sees is convert toe to sodium and the one hide regime for Sophie, these compounds above it's called sodium that hardly straight point is called sodium hydrogen Wasfi. Now that compound converted toe to sodium. So the evil full of the iteration it's you goto basic media. So there is another equivalent boy. Then every s sodium hydroxide again. It convert toe three sodium force feed it called sodium to speak. Also it go up, but now we didn't deal. It's another equivalent because the indicator we use one exist here and one existed he so we call. There are toe equivalent depending on the indicator use. So now any poorly Protic, pass it. We reacted. So do my work Sign it. Converted toe completely toe other commands. His covert equivalent. Then it converted toe Other compound. These mother equals Thank you

So we want to know about the pH at the equivalents point in the Titra ation of a weak acid. Let's say, for example, HCM and we're going to tight treat that with a strong base like K O. H. And let's say that we initially have one bowl of the H c N. Then it's going to require one mole of the K o. H to consume it, because it's understood that there's a one here in a one here. This would be the balanced equation, and we would produce KCM. Uh, that's what's right that as a Net Ionic K plus plus C and minus plus h +20 and the reason I wanted to separate those is you'll have a mole of K plus. But potassium ion does not have any acid base activity. Um, so let's do this in terms of our initial concentration and our final concentrations. And so initially we had none of the products. Of course, the water is there in high concentration and doesn't change its concentration. So we're going to use up all of that and we're gonna have zero of the h. C n at the equivalents point and likewise all of the K O. H will be used up, and we'll have easy bro at the equivalence or endpoint. We'll have one mole of the potassium ions, one mole of the cyanide ion were nearly right. That is K C N right, but that's a strong electrolyte, and it's in the form of potassium ions and cyanide ions. And again, we don't really record anything for the concentration of water, since it's very high and doesn't change now. So what do we have at the end of the titrate Asian? We don't have any more of the week base. It has all been used up. I'm sorry, the weak acid, and we don't have any more of the week base either. What we have done is we have converted all of the weak acid to its conjure get base. And therefore Ph is greater than seven at the equivalents point at the equivalents point. What we have is the cyanide I on, and it is a base. It's the conjugal base of the HCM and said the pH would be greater than seven

But also the given that of all this question, there's a number of moles of weak as it is. We're going to 5Molds and the volume of K. Wet is 10 Mil. So the concentration of potassium hydroxide is 3.00 M. And now the number of moles of protection hydroxide will be 0.010 into to the um which is It was 2 0.03 walt. No, the volume of solution is 1.5 00 leader. So and the major ph is given and the question is 3.85. So let it be that let H A B that weak acid. Now the reaction between the acid and the base can be represented as follows at T. Equus let's which negative equity is gives a negative equals plus is too in liquid. Before reaction walls was zero point 250 in 23 30 And after the reaction, the walls will become 0.25 zero Point you know city. Which is it goes to 0.22. Now the concentration of the contributor peace and the answer can be found us. He negative because 20 03 molds phone 1.500 later It is around 0.02. Um so it's a Equals to zero two worlds upon 1500 one body late Which is equals two 0.0 to him. No, It's not terrible. And zero in a hurry comes out to be 0.147 M. And we know know the formula. The formula is We are concerned with the H equals two BK less log. There is a bonus it. So after substituting the values will get P. H equals to 4.72. And that's the answer. Thanks.

In this question. Where, sir? That we talked about a week on a project. Cassie, which I'll call Ah, hey Eyes Patrick DeWitt's little 0.100 city of my drugs I and it requires 15 points at all millimeters off sodium hydroxide to reach D equivalence point. So I can't write a reaction between Down Be and a Qassem issue. Oh, so if it requires 15 millimeters of city of my dreams that you reach equivalence point wondrous, you want innocents like you mentioned for the reaction so we can calculate the number off all sodium hydroxide and require Theresa quit plans, fights, and I will give us a number of whole. Okay, how's it so 0.100 you know, one meter and one toldem millimeter. And, uh, that's what's to seven point. They're all there upon one's original hole. That means so in a few team military self study of my drugs out contain are minimal. So that will be, uh, city sequence one 50 invited by one Taliban. So that is still ones. You knows it all 50 So that means we have several 0.0 by home. Off serial. My drunks and Oh, yeah, 0.0 by mole. Well, the hazard. Okay, so the question said after trying to fight militar hope basis hearted B h Oh, the solution is 3.62 So we got two estimates The P k. Well, so ph it's, uh, peek a loss. Long hope the salt, which is going to be any Hey, do you find it by concentration off the acid. Peachy. So 25 whole wheel off course content to sand. Um, number of more off the case of the acid if we have turned five. Esther if will had tried it. Five meal If you don't find me, it was hard ID then, um, 25 male off days content are minimal. So five mil would be, um, 0.0 to five hole. Oh, any wage. So if we have ah, decision. Isha, if we have ah, 0.25 mole off any wage to this. Okay, I'm just gonna write this, But this year Hey, close any Ohh to produce, uh, and a hee loss issue. So when I call these i c e. So, initially we have 0.5 hole. Okay. Uh, h hey! And we put syrup on 00 to 5 off any leech. So have 0.0 25 off, huh? Any it produced and then it change will be we lost for them. This is gonna be dash initially. Then the change will be minus 0.25 And this repetitive point, they're there to five. And this would be Don't want There is 0 to 5. Right? Then we'll have 0.25 off this left. This is 0.25 So the ph I was given to us Western by 60 is a cost of Piquet loss. Log off and he'll be zero points. It'll there to five. H will be general 0.25 So just to be one on DA that Miss p k, he will be a cost. 3.62


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