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The larger Ka (smaller pKa), the smaller Kb (larger pKt): Stronger the acid, weaker its conjugate base, and vice versaCalculate Kb for the base F- anion if Ka = 6.8...

Question

The larger Ka (smaller pKa), the smaller Kb (larger pKt): Stronger the acid, weaker its conjugate base, and vice versaCalculate Kb for the base F- anion if Ka = 6.8 x 10 ^ for HFCalculate Ka for NHa* if given Kt = 1.8 x 10-5 for NHz:For a 0.20 M NaF solution, calculate Kb' [OH:]; pOH, pH. Ka = 6.8 x 10 4For 0.15 M NHACI, find pH NH3 has a Kb = 1.8 X 10-5.For HCN, Ks = 4.9x 10-10_ Calculate [OH:], pH, [HCN] for a 0.010 Maqueous solution of sodium cyanide, NaCN: CHEM 1516 Loekmw

The larger Ka (smaller pKa), the smaller Kb (larger pKt): Stronger the acid, weaker its conjugate base, and vice versa Calculate Kb for the base F- anion if Ka = 6.8 x 10 ^ for HF Calculate Ka for NHa* if given Kt = 1.8 x 10-5 for NHz: For a 0.20 M NaF solution, calculate Kb' [OH:]; pOH, pH. Ka = 6.8 x 10 4 For 0.15 M NHACI, find pH NH3 has a Kb = 1.8 X 10-5. For HCN, Ks = 4.9x 10-10_ Calculate [OH:], pH, [HCN] for a 0.010 Maqueous solution of sodium cyanide, NaCN: CHEM 1516 Loekmw



Answers

Consider a buffer solution where [weak acid] $>$ [conjugate base]. How is the pH of the solution related to the $\mathrm{p} K_{\mathrm{a}}$ value of the weak acid? If [conjugate base $]>[\text { weak acid }]$ , how is pH related to $\mathrm{p} K_{\mathrm{a}} ?$

So the reaction when dealing with here is we have h A, some weak acid in water associating you know, the words acting as an asset to become HDR plus in the country of base. Now, for every single acid we have a k a value and equilibrium constant that governs this reaction in that K is equal to the mass action expression concentration age 30 plus times a conservation of the congregate base over the concentration of the week Asked now, whenever the concentration of a minus is equal to the contradiction of H A, those two will cancel out. As you can see like that. And we're going to get that the KKK equals the concentration of age trio plus, which also in turn, tells us that the PK equals the pH because you never really it's the same thing. You take the negative log of this value or this value to go from that sector, this stuff. And so now what we're looking at is so whenever these two are equal the pH in pkr equal Now, in the first scenario, we're told we have mawr A my are for me. We I think it works Well, we have more. Ah, weak acid. So we have more h A and so we have more asset. That means that overall, the solutions give me more acidic. And so p k is a constant that's just related to the K. And so pH is gonna go down. And that means pH in the first scenario is going to be less than the PK and then in reverse. The next question PK will be less than the pH whenever we have Amore country base and you can see it using the K expression to Let's just first scenario where, if we have, let's say we have some value of two over here and one over here. When we multiply that over, we're making basically with the instead of having the pH equals the PKK, we're gonna have pH times the negative log of two times K, which is bigger. And so, yeah, that's how we get around. So there's multiple ways of thinking about it. Hopefully

Yeah. In this question 0.1 Mueller plurality as if solution is given and his speeches given us 1.96 We have to calculate the K. A. And BK of this asset. Now ph is given as 1.96 Therefore ph means negative law hydrogen in concentration which is 1.96 Therefore hydrogen in concentration is tend to be poor negative 1.96 Therefore concentration of H plus and minus 0.11 Now let's write the ionization reaction. Uh laura a city cassie eight C two H 202 cl plus water. Yeah. Yeah C two H 202 Cl miners plus. Is to you plus mm I think I like this one dog plus face trio plus in a solution. Now let's make the ice double here. Yeah, here initial concentration is 0.1 Mueller gino gino since concentration minus six plus six plus six. And the equilibrium concentration is 0.1 minus six. It's it's now we'll write the expression for A. A. K. A. Is concentration of C. Two H 202 Seal minus times concentration of a studio plus divided by the concentration of the acid. Yeah now concentration of this one and this one is X times six. X squared divided by 0.1 minus is now here exist concentration of high dona maya. That is equal to concentration of the low acidity ir with just 0.11 So less right X square means 0.11 square divided by 0.1 minus 0.0 point 011 So to the 0.11 square divided by 0.89 And the value for K. A's therefore K. A. Of this S. It is 1.4 times 10 to the power negative three. Therefore PK will be negative Law K. A. That means negative law 1.4 times 10 to depart negative three. And the value for P k. A is there are four quickie in you is 2.8 five. So this is the value for p K. And this is the value for K. For claro acetic acid. Mhm.

So here we are, given the example of a weak acid congregate based system where the concentration of weak acid Is equivalent to 0.45 molars. While the concentration of weekday conjugate base is equivalent to 0.63 molars. And were asked to determine the ph. So we can use apply our Henderson Hasselbach equation, which states that the pr were the ph is equivalent to the PK Times the log concentration of our country at base in our weak acid. And were given that the PKK for a weak acid is equivalent to 3.74. So we can substitute everything into our equation here. Yeah, yeah. Which leads us to find that are ph is equivalent to 3.89 and this is our final answer. And this makes sense since in this case the concentration or contribute base is higher than that of our weak acid. So we can expect the ph the higher than piquet and that's it.

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.


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