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QUESTION 35What is the pH ofa 0.80 M solution of acetic acid? [Ka-1.8 * 10]A none of theseB.47C.1.9D.2.4 13.6QUESTION 36What is the H" ion concentration in a +...

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QUESTION 35What is the pH ofa 0.80 M solution of acetic acid? [Ka-1.8 * 10]A none of theseB.47C.1.9D.2.4 13.6QUESTION 36What is the H" ion concentration in a +0x :10-IM barium hydroxide solution?None of these 2Sx lo-ll,40x 10-4M13x l0-llM34*10-IM

QUESTION 35 What is the pH ofa 0.80 M solution of acetic acid? [Ka-1.8 * 10] A none of these B.47 C.1.9 D.2.4 13.6 QUESTION 36 What is the H" ion concentration in a +0x :10-IM barium hydroxide solution? None of these 2Sx lo-ll, 40x 10-4M 13x l0-llM 34*10-IM



Answers

Calculate the $\mathrm{pH}$ of a $0.36 \mathrm{M} \mathrm{CH}_{3} \mathrm{COONa}$ solution. $(K_{\mathrm{a}}$ for acetic acid $=1.8 \times 10^{-5} .$

So we're asked to find essentially the ph values of three different acidic solutions. So our first acidic solution is has a concentration Initial of one moller And a PK of 4.76. So a weak acid has the general equation of the form H. A, yields H plus plus a minus mm hmm. So it's essentially as a concentration one Mueller. But some of that dissociates. So we can write our equation in the form K. A equals the concentration H plus of times a minus over H. A. So this becomes X squared Over one -X. And so we're going to try to make the approximation that the dissociation is not significant. So X is much less than one roller. And then basically we can rewrite this as 1.0 and this becomes the square root of 10 to the negative 4.76, which is yields that X is equivalent to 0.004 molars. So the concentration of H plus equals this quantity here. And basically we can check our approximation by finding that essentially are approximation, is satisfied. So the concentration H plus isn't uh here and ph is the negative log of the concentration. So we can find that essentially the ph in this case is equivalent to about 2.398. And we have to pay attention to significant figures, since for assets and basis, significant figures are basically after the log digit are considered significant. And we have a second solution of the form. Basically we have metal I mean, so pro donated method, methyl amine is essentially this compound. So we can essentially find that person aged methyl amine can disassociate into metal mean and a free hydro uh free hydro uh free program. So we are also given information that the concentration initial Is equivalent to 0.10 molars. And that the PK is equivalent to 10.7. So we're basically going to do the exact same processes before So we can rewrite this as 10 to the negative 10.7 is equivalent to x squared over 0.10- X. And we're going to make the exact same approximation that X is much less than 0.10, which will definitely find be true in this case. And then we can take the square root to find the concentration of X. And we can find that the concentration of X is equivalent to 1.4, 1 times 10 to the -6 molars. Yeah, so for the ph we're going to take the negative log of that constitution and we can find that the ph is about 5.850. The reason why essentially this worked normally metal mean is technically a base in its own predominated form. But we can essentially assume that all of our pure form initially is pro native metal. Mean? So the behavior could be more like an acid rather than the base, which greatly simplifies this question down. Or else we would likely have to use KB or something else. Or we can use mass charge balance, but that's unnecessary in this case. So for the third question essentially have a buffer system. So we should use the Henderson Hasselbach equation or pH equals P K plus log of the concentration of a minus or the conjugate base over the concentration of weak acid. And so we're given that the PKK is equivalent to 3.76 And that the concentration of weak acid is 0.3 And the concentration of the conjugate base at 0.1. Yeah. And so we substitute this into a calculator and were able to find that the ph Is equivalent to 3.46. And that's it.

Question. Number 74 is also a buffer solution calculation. A buffer solution contains a weak acid and its conjugate base, both at similar concentrations. I'm not going to use the Henderson hassle bolt equation as I did in Question 73. I'll do it the way this textbook would suggest. Let's just start with our traditional equilibrium. Recognize that the K expression is asked to take concentration multiplied by hydro knee Mayan concentration divided by the weak acid concentration. Excluding water because it's a liquid. This then corresponds to a common ion type calculation. The K A value is given to us as 1.8 times 10 to the negative. Five were given the acetate concentration of zero 0.18 We don't know they hydro name ion concentration and were given the acetic acid concentration of point to one Moeller. So 1.8 times 10 to the negative five will be equal to zero point 857 multiplied by the hydro Nehemiah in concentration. So the Hydro Nehemiah in concentration then will be equal to 1.8 times 10 the negative five divided bye 0.857 And when we do that, we get 2.1 times 10 to the negative five. The pH then will be equal to the negative log of this value 0.1 times 10 to the negative five or four point 68 That's our Ph.

Everyone thes question. We think for all of us, fine. But we will try to solve the eight clearly and directly from you. So in this question he want us to their minds of the edge. We don't know that reminds me which we have two away the first way. It's equal negative law. The concentration off each postive or some right h history postive off is that we speak about aka solution or sometimes it will be equal 14 negative value or be wedge. So we have the way to found their value off. Yet we have your four cases cases. We will solve a separately in first case and Second Gezi are similar. So we were so busy in here in first games with each on it's I don't have a K a city concert. So it's this is strong. What's the meaning of strong as strong as its that meaning We just solved it in a water it completely ionized toe hydro on your loss Are you the negative? So the doctor concentration off it open toe or 48 will completely disassociated give us concentration off hydro volume or going toe for a consideration off ally or going toe for eight. So now we have the concentration off their high Drona so we can apply it in the B H u l o negative logs of concentration off this pro Tony, um to find to be ej so we can ride in. The first case of B H is equal negative logs the concentration off Droney, which is similar to the concentration off H I. Toby. The result equal if using is a creator. Wrong 0.32 in second. The gays. It's similar here We have a cheesy before as long as as it not contain K a value. So it's a strong what? The meeting off strong wind boudin water is completely our minds. That's mean, only it's a concentration, which is open toe. Oh, a 95 minority. We'll discuss Ito h. A positive open toe a line five and beer can read. Also opening toe a nine. Fine. So now we have the concentration off Latonia that right in a water hydro nya, he's open 0895 so we can create knows a V h a darkly, which is negative. Log the concentration which is or going toe 895 which equal if we use a calculator One poin for a Now, For the sir, The case we have a juicy and for which is a strong acid and ages in which we are strong acid and the bulls exist in a water by these concentration, we want to know their B s Here I was assaulted in the new board that Petrossian or four. As we stated, it's a strong asset that minutes completely organized, which a positive and seal off foreign aid. So if it's a concentration, is opening toe for five similarity. So the concentration of plutonium or goingto 45 mil aridity and become great also goingto 45 melodic. Also, we have a cheesy Alex's strong acids which is completely organized in a water last rite of water. So it will be a positive and ceiling negative. It's a consideration. Off a chisel is open toe for a in a water, it will be zero which all this, you see, Toby is a concentration of broken him on for a polarity and Cielo 00.48 manana. So now we can see the total concentration off each postive is the psalm off days together So it's all going toe over five blasts or going toe for a which is equal mine three times by 10. Negative story, More legit. So now we can calculate to be a true direct which is equal negative logs a concentration of Britannia, which is mine. Destry times violated our negative three, which is equal 1.3 returning it to the first question We now speak about their force case and this case is very important. We have solution that contain 1.9% at UCL by mass It's me. The mask off h e C Air buys, um, daughter mass times among 100 is one point, you know, human dynasty off. Total solution. Look here is one going to want the dentist off solutions that mean the weight off solution divine and buys a volume off total solution. Okay, Is one going zero? How can we solve with this? It's very important to solve. The eight women want to know the polarity off h e c n. Because if we no similarity off hcl, we all know in water it convert completely tow each of pasta vincey in the negative. So even no similarity off HSC and it will be similar similarity off each positive so they'll be EJ will equal the negative logs is more light. So to found a polarity, we must be found from the definition the number off more off h is e mail in a one liter solution. This is important. So we want to know how many more h e c l in one litre which is this is a polarity. So we put here in directly in thes law. So first of all, he give us the dynasty off solution equal bomb coins You want grand? They're each one milliliters. So how it will be in 1000 milliliters er which represent one liter. So by crossing. So we were time to 1.1 by 1000 divided by one. So it will be one 010 Graham in one leader. So this is the first part off chance that the weight off total solution Because this is a dentist off starter solution. The week off solution is stenting were each one liter solution. So we solve is a response a second about we want to move the weight off HC and how can we know that first off, Only told as a percentage off, HCL by way, is one going 09% which you mean divided by one? Hardly. This is it's a percentage from the total way off solution. So when with times his percentage was the weight off solution which is consumed, it's a wanton 10. Don't forget these wait in one liter solution because it's we want. So we can found that that interesting exist. Boy a moment 11 boy 00 Knowing Graham at U. C. L. A. In one leader. So do we can calculate the number of monetization in one liter solution. Yes, if we divided the way, which is 11.9 buys a molecular weight off Giselle, which he 36 going Fine, because the atomic weight off C. L is 35 on five and the atomic weight off, which is one social molecular with its 36 from fine. So if we divided says we can get the number off, move off H E C air in one liter solution and forget this continue as a page. By dividing XYZ, we found that the number off more of a CI si is a 0.3 point 16 moon off agency ale in a one litre solution. So this is the definition of morality. So we can know we have concentration off HCL open Seriozha one sex and Moola. And we all know HST Alien water is a nice to each oppose the Colosseum the negative. So the concentration off each a positive is open story 016 similar. So then we can say that the bee edge is equal negative logs a concentration off each positive, which is open 3016 So the age value will be or going five to these bark off questions, the concentrate only because this part is very important and the knee specific information to solve a thank you.

In this. Make sure which is consistent off Ascetic said and sodium s city. Sorry. We write it again and sodium a city. These make sure we want to calculate its be ej. This is make sure are acidic buffers. So we use a low beaky, eh? Last long. The concentration off sodium acetate divided by the concentration off ascetic has it is that Mickey A isn't giver, which is a gay value is 1.8 times by the morning to find. So the B k is negative logs of value off K A. Which is wrong going, eh? Times voi timbo are negative. Fine. In this question, we change is a concentration off sodium exited and ascetic acid which important, eh? We use a concentration off sodium city is open toe five and the concentration off ascetic is so boring. One e in the party we use the concentration off sodium acetate is open to five. Sorry. 0.1 here is going to go on and the concentration are going to find important. See, we use a concentration open too. And the open 08 And the importante. We use a concentration or 0.8 and or boy in two and we want to calculate the B H in each case is so if we saw buys these information, we will get the pH value is equal fine 0.14 by sub. By this condition for concentration, we gets a PhD equal four points, three fine by somebody's this condition with girls that ph equal 5.15 and by sub, by this condition, we get its equal 4.35 Thank you.


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