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When the neutralization is finished: The first part of the titration is forming a buffer, whose pKb is based on the curve of titration: The large slope of the titra...

Question

When the neutralization is finished: The first part of the titration is forming a buffer, whose pKb is based on the curve of titration: The large slope of the titration curve represents a finished reaction and is used when a curve is drawn to determine the pH of neutralization:Match the terms with their meaning, which are describing_theabove example (which is a particular case, do not generalize, the unknown is the base and the known is the acid)The analyte is the.Choose.The end point means the

when the neutralization is finished: The first part of the titration is forming a buffer, whose pKb is based on the curve of titration: The large slope of the titration curve represents a finished reaction and is used when a curve is drawn to determine the pH of neutralization: Match the terms with their meaning, which are describing_theabove example (which is a particular case, do not generalize, the unknown is the base and the known is the acid) The analyte is the. Choose. The end point means the solution change of. Choose . pKb of the titration is a pH: Choose__ volume end buffer line the large slope of the titration curve phenolphtalein lower than pH-7 greater than pH=7 color acid start buffer line mid buffer line base The pH of neutralization is _ The indicator is_ The titrant is the_ The equivalent point is on The titrant half volume corresponds to the



Answers

Consider the curve shown here for the titration of a weak base
with a strong acid and answer each question.

a. What is the pH, and what is the volume of added acid at the
equivalence point?
b. At what volume of added acid is the pH calculated by working
an equilibrium problem based on the initial concentration
and Kb of the weak base?
c. At what volume of added acid does pH = 14 - pKb?
d. At what volume of added acid is the pH calculated by working
an equilibrium problem based on the concentration and Ka of
the conjugate acid?
e. Beyond what volume of added acid is the pH calculated by
focusing on the amount of excess strong acid added?

For question number 125 you need to prepare a first derivative titrate Asian curve. A first derivative titrate in curve is where you determine the change in pH over the change in volume, and you plot that as a function of the volume of Thai, Trahant added. So if we go back to figure 19.8 on page three or 8 38 we will have all of the's values are the volume of Thai, Trahant added. And the pH, after a particular volume of titrate has been added. And you can see that this goes from a volume of zero all the way to a volume of 80 mL, then what we have to dio after in putting all of this data into an excel file, if we want to calculate the change in pH over the change in volume. To do that, we can highlight a cell. And as you can see, I have up here of formula. That is the change in volume B three minus B two b three, minus B two over a three. This cell minus a two. After we do that once, all we need to do is we start with an equal sign equals what I just talked about. Then we simply grab the bottom corner and pull it all the way down to the very last one. And it'll fill in the rest of the column than the average volume. We can simply put in to ourselves, equals the word average and then parentheses. A two and a three, and it'll calculate the average of thes two numbers. We then grabbed the bottom corner and drag it all the way down. Then to plot these will simply highlight these two columns and then go insert chart X Y scatter, and we will get a graph that looks like this. If for some reason this peak is going from left to right instead of up and down that all you need to do is right, click Go to select data and change your X and Y values In looking closely, we see that we have the greatest change in our the greatest change in ph. Per change in, um, volume at 41 which is just anomaly of the data, it really is somewhere between here and here. But probably the best estimate is going to be 40 mL. So we would say our equivalents point volume, which corresponds to the apex right here would be 40 mL.

So for a year, the, um it's a started nine. A 7654 32 and one. And then we have 246 and 10. It's well, so I've wanted that there and there. So look something like that for a and then for a B 12 10 we'll have to 17 12 17. I'm 22. So start here a 12. Go to about seven. A little drop, um, and then a little bit after 17 another drop. I'll go down there then for C Oh, you're looking at the graph, and we can tell that, um, yes, will be 100 and 90 new leaders. So my process for do you are going to get 189 million years and then lastly, 40 um, the percent of any to see every by mass and the simple will be about 8.3%

So in this problem, we're given a block like thiss, which is a tight gration, a bladder carb which shows the patrician ofthe week mon a pro take acid with a strong base and here we have to answer some questions. So our first question asked, What is the pH and what is the volume of a red base that the equivalence point. So as we know that the equivalence point of arbitration car is the steeper portion off the car, that means at this point, and also the coolants point is, um, just a half way between the steeper portion. So we can consider, um, this point in the middle of the steeper portion as they given spined knife, he draw a straight line or apartment will align to the volume access we'LL see that it's our own turkey mill. So the volume and day equivalence point is thirty ml. And if we draw another straight line, tow the beach access. Who will say that it's around nine. So are you B h. And they go on this point is nine now in question be You're just Ah, what volume ofthe edit bays At what volume? Off that base is the pH calculated by working and equilibrium problem based on the initial concentration and k of the weakest. So the answer is zero ml. So when we are so when we have not added any of the basis or when the morning of the basic zero. That's the point r R There's a time when, um, the pH is calculated by working in equilibrium. Problem based on the initial concentration and k all the way. Gets it now in question. See your ass that what volume off that base does the Ph physical peak. So the page is equal to peek, eh? Ah, there's happens on we are halfway through. They given spine. That means since our equivalence born volumes thirty ml, the pH will be called Toe Piquet. And halfway off this volume, which is fifteen ml sarah in roughly fifteen ml, we will have our beaches ableto piquet and and in the question D, we were asked at what volume off that base is the peach calculated by focusing on the concentration and K b of the contract at base. So that question is so The answer to this question is tardy ml So this is the equivalence point at which we calculate the pH best on the concentration and Gaby off the consequent base and finally and question E. We have to go say what volume off that base is the peach calculated, um, by focusing on the amount of excess strong base at it. So this is beyond the equivalence point. So there's beyond. They give us point or target mill so beyond this volume on the pH is calculated by focusing on the amount off excess strong base at it.

Hello. So for the airport of this question we have been giving five parts. So for the airport we've been asked about equally point. So as it is a week based strongest meditation so equals point is not neutral So it is acidic in nature. So the ph will be less than seven from the above graph. The conclusions are drawn so on the ongoing a perpendicular line upon the Y axis From the equals point. Ph found out to be six on drawing apart particular line upon ex excess. We will get the equal is volume and the volume comes out to be 25.00. So therefore the ph at equals point is six and the volume of the acid Added at equals point as 25 points 50 25.00. We'll be back at zero point 00 of acid ph can be calculated by working on the equilibrium problem based on the initial consultation. So this is done by using KB of the base. This can be done by using calculate producing give your TVs see point. So R. D midpoint 12.5 soon and difficult. So the ph will be equals 2 14 minus K P PKB. So these solutions becomes buffer. No, for the deep part. Uh huh. 25.00 ml of ph is calculated based on the concentration and k of they conjugate acid because 25 ml equals point that there's 25 million equals point. So initial molds of the base are equal to the most of strong acid is added. No, for the part. So beyond 24 25 5 11, sorry for the handwriting. So it is the ph is calculated by focusing on the excess amount of strong as it added. Okay, so that's thanks.


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