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Il a buller solution is 0.140 M in # wcak buse ( Kh 82* iu ard 0.550 M in its conjugnte acid; what is thc pH?pHTOOLS x10"...

Question

Il a buller solution is 0.140 M in # wcak buse ( Kh 82* iu ard 0.550 M in its conjugnte acid; what is thc pH?pHTOOLS x10"

Il a buller solution is 0.140 M in # wcak buse ( Kh 82* iu ard 0.550 M in its conjugnte acid; what is thc pH? pH TOOLS x10"



Answers

Acid Solutions.
Determine the $\left[\mathrm{H}_{3} \mathrm{O}^{+}\right]$ and $\mathrm{pH}$ of a 0.200 $\mathrm{M}$ solution of formic acid.

So in this, uh, situation, we're dealing with Ben's OIC acid, which I'm going to label as H. Benn's. You'll see this sort of thing very commonly where you have HB H and then some word basically to show this is an acid. And so the reaction we're dealing with is that H. Benn's Ben's OIC acid in water associates to give us aged 30 plus and the conjugated base benzoate. And so there is a K value that describes this is a k A of H. Benn's about Ben's OIC acid, and that is equal to 6.46 I'm sensing a to fit. This is something you can look up apartments dance the negative fifth. And so what we're gonna do is we're gonna do a nice table for this for this reaction over time, As you do a couple of these, you no longer need to do this. But I'll work through on this line, and so we have our I'm going to raise this. Just hold on to that value. A nice table involves having our initial amount, the change in amount in our equilibrium. We always ignore water because that's a liquid concentration doesn't change in office. So for it to be relevant in most not part of the mass action expression, initial concentration of H. Benn's we have is given to us as 0.1 Moeller. There's really zero molars amount of our products here. The changes over looking for its minus acts whose walks you lose acid and it's be gonna become age deal plus and minus. And so we have 0.1 minus acts X and X. Now remember our K, a value that I mentioned earlier? That's the mass action expression, which means it's the it's the product. First of the concentrations of the products here that's ah product, meaning the 1st 1 meaning the multiplication off the concentration of these two over the concentration of the original acid. This is something you should become for with writing out a mass action expression from A from an equation. And so now, if we plug in these equilibrium values, we get that r K equals acts. Times acts over 0.1 minus Acts in RK again was 6.46 times. That's a negative fifth. Now you could plug us into a calculator. It's gonna be a contract quiz you could get value of X, but often we don't want to go through that work of using a quadratic equation. And so we will ignore this minus acts because generally speaking to me a lot smaller 0.1. Unless this point unless the initial punctuation is very small, it you can ignore it. And so we can get a value of acts which is again gonna be equal to the concentration of H 20 plus, which will equal 6.46 times 10. So negative six. The army of X squared and then acts well equal 2.54 times tense. A native third, if we want to find the pH, will take the negative log of acts that concentration ratio class. This is by definition, of what Ph is, and you will find that it's equal to 2.59 and that's all they've asked us for

In this question we have first of the HTC l, which is the HCL, is a strong as it so it completely ionized toe each postive blast, See and negative. That's mean the concentration of itself which is open before will goto 4.24 h and O boned full force. Yeah, so now we can complete the B edge which is equal negative logs the concentration on each poster which is all going toe 04 So the value off Ph is 1.4. Which of these e the value off the edge off the HCL. So comparing vessel for IQ as it the sulphuric as a the first step off it is strongly or completely honest Toe h foster plus H s +04 negative. So here's a concentration All h two So four is so boring. Oh, for is completely converted toe h postive and each is old for a negative. Then the H is so for negative is partially a nice toe. Another h postive plants is oh, for negative too. So the concentration here, which she wars 0.4 will mount off and remove with cheese eggs to form h postive and is off for a negative on the year we have K A value. So we can say that the value off key A which is equal 1.3 times Boynton bore negative too. Which is it mean? The organization is a strong here will be equal the concentration off each time by the concentration off sulfites excess square divided by the concentration of HS over which is a point or four negative toe the value off eggs. So now we can write it and equation of the following. It will be excess square los 1.3 times pointing bower negative toe eggs Negative too old 0.5 to ALS These equal zeal so we can solve this equation by things that here is one. So it represent a and most of Montri is be and the negatives is value a C and we used these equations that the X is equal negative b Here we will use the boss stale the root off Be square negative for a C divided boy to a So by solving it we found that the value off eggs is equal. Oh, going toe 045 Muehler. So now we can say the concentration off H four Still in case off sulphuric as it is equal 1st 4.4 plus the value off each most. If sorry here is so boring. 05 So plus 0.0 05 So it will be total equal Olboy mind Oh, for five muehler So sorry, sir. I'm sorry for this. It's wrong. Here's the value off exam story For this, the value off X is equal. Oh, going toe 172 So the total concentration on each posted will be going toe 04 or Steve than you value which is equal or Boeing toe 172 So the daughter concentration off each postive is equal were this so that total concentration will be opening toe 0572 So now we can calculate the value or B h which equal negative loves the concentration off each postive. So it will be one going to four. So here we found a B H decrease. That's mean the amount off each postive is higher than the amount off each Posted images in HCL for thes concentration. Open toe four for one image here for H and many other age. Thank you

So we're told that the sodium salt of some base B minus right here in the constellation of 0.5 Moller has a Ph of nine and were asked to figure out what what the pH is of a 0.1 Moeller, um, concentration of HB, which is a confident asset of B minus. And so the first thing we want to use is this information pH being nine, this concentration to find what the K B is of B minus. And then we can use the K B to find the K and then do a simple I stable calculation to figure out what the Ph is for the contest. And so we're going to need to find the constellation of O. H minus. But first we have to start with find the conscious of HDL plus because that's what we can do because all we have is the pH. And so this is a relationship that is very important that comes from the definition of the relationship between Ph and HBO plus, and so we're told that this is, uh, tend to that this is going to be not. So we're going to find the constellation vacio plus is tense the negative night. Then we need to find the constellation of O H minus. That's what we're looking for. We use this relationship, which equals tends to never the 14th of the concentration of O. H minus and a steel plus. It's sensitive 14th plug intensive, negative ninth, and you'll find that this Eagles sense that I get 1/5. And so now we can look toe writing expression for what KB is. And so KB of any sort of base reacting with water is always going to be equal to X Square over the initial concentration, which we're told is 0.5 minus X, where X is equal to the concentration of O. H minus, as well as the concentration of the contract acid. And so we are. We just figured out what the consolation of O. H minus says that it's 10 to the negative fifth, and so that's really convenient. Now we have all these, all the information we need. We have X squared. We have this X right here needed to find baby and calling these values in. We'll find that K B equals to time sense the night they're attends the negative apartment. And so then, from there we'll use the relationship that K b times K of the congregate acid equals tents, a negative 14th and so we can see we could plug in this KB right here and all right out. What? The result is that we'll get for K on this next page here, Que is going to equal 4.99 time sense a negative six. And so now we're going to do it. We're basically starting a new problem where were given a k a value and were given initial concentration of 0.1 Mueller for some massive h A, um which is equivalent to what I was talking about before as HBP. And so now we remember that que is going to always equal X squared over the initial concentration 0.1 minus X. But this time, instead of having X, we have k A. And what we're gonna do is because access always gonna be much smaller 0.1 or just ignore. And so now we solve for K um, for X plugging in this K over here, I don't find that X is equal to 2.235 times cents, Innegative, fourth Moeller And this is going to be equal to concentration of HDL plus. And if you don't remember why, it's because this reaction is going to be a Che plus water being an equilibrium with age, the Rio Plus and a minus. And so this X refers to each one of these products right here. It's H 20 plus and a minus. And so now we're gonna take this value that we have right here. And we're just going to say that the pH equals the negative log, the concentration of H two a glass, which is the definition there, and plug in that value that we just had 2.23 times 10 to the negative fourth, and that equals 3.65 And that's our answer.

You to calculate the concentration off H E three or Bostick, which is the present, that concentration off plutonium, iron in borders and the calculations of the age off. 0.2 polarity formic acid toe. Answer this question. We must know the time off these asset formic acid. We were right it as each if our these each of our win booting in water smart. Some of them are unionized toe h astri or post there and the rest off the compound. Which is a firm, eh? So we can see at the start is their concentration is open to while knows nothing by month's end. Equilibrium when we reach it toe the acidity, conversation offices as a a small amount of aid, our organized toe registry, a postive. And for me, the value off. It's a sedative called Mr Is Given, which is a 1.78 times by Thin Barber Negative four, which is low mounds that mean very small amount off formic acid. Will our alliances mean the X is very small convert toe opening, too. So we write the law. We were I ke A is equal to the concentration off H history or poster times by the concentration off four minutes divided by the concentration off for Mick, I said Zeki is given, which is 1.78 times by Tim Barber. Negative four. The concentration off Brogna were prison eight eggs. Wine for me is X Also so x square and their consideration off former colonized is open to negative X as long as the value of K is very small. So the eggs compared to going toe is very small so we can neglect it. This simplification is acceptable So now we can know the value off eggs which equal the route off 1.78 times by steamboat or negative four times by old bowling tool. So the value off X will be six times Timbo Rh negative three more clarity which is the ex here represent the amount off 100 humans amount off for me and the comparing to open toe It's very small come bearing duet So now we have the concentration off on their own You much if this is the first part Me mama the second But we want to calculate that the edge that me h is equal negative log the concentration off hydro in your mind, so it will be equal negative. More the value. Six time stain Barber. Negative three, which is equal to point toe and disease value is for a sedative. Thank you.


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