- In this video,we're walk to be talking about conjugate acid-base pairs. We're walk to present the idea of a conjugate acid-base pair using an example reaction. The instance reaction isbetween hydrogen fluoride, or HF, and water. So hydrogen fluoride is a weak acid, and also when you put it in water, it will certainly dissociate partially. So some of the HF will certainly dissociate, and you'll obtain fluoride minus ions. And then the dissociated H add to ion. Therefore this dissociated H to add ion will get donated come our water. Therefore water climate becomesH3O plus, or hydronium. And also so this procedure isin dynamic equilibrium, reason it deserve to go forward,and it can go backward, and also eventually, those two prices are equal, and they're both happeningat the exact same time. For this reason in this reaction, we havea pair things going on, and we're gonna think about it in terms of hydrogen ions being exchanged. For this reason if we simply look atthe hydrofluoric acid, and also we look at in the forward direction, our HF is ending up being F minus. And it's doing that by donating or losing, therefore I'll placed a minus for losing a proton. So our HF loser a proton that develops our F minus or fluoride ion. And also then we can look at that same procedure happening in the backwards reaction. Therefore if we look in ~ the backwards reaction, i beg your pardon is also happening, the fluoride ion can pick up or expropriate a proton native somewhere. Therefore it deserve to pick increase an H plus, for this reason I'll have a plus, H plus here. And so once fluoride accepts a proton, we reform ours HF. So we can see that HF and also F minus have actually this special relationship where girlfriend can type one or the other by shedding or obtaining a proton. And also we deserve to see a comparable relationship in between water and also hydronium. So, water here, we stated water is agree a proton native HF, therefore we watch that water will get a proton, and also that will provide us hydronium. In the reverse reaction, hydronium can lose aproton to reform water. So, minus H plus. For this reason again we have actually these two species, water and hydronium, the are pertained to each other by having, or no having, one H plus. So in chemistry, we call these types that are associated in this means conjugate acid-base pairs. For this reason the main definition, or mine official meaning ofa conjugate acid-base pair is as soon as you have actually two speciesthat are concerned each other. Let's see, two varieties thatare concerned each other, connected by one H plus. In this case, we have actually HF and F minus the are concerned eachother by that one H plus. And so HF and also F minus area conjugate acid-base pair. We likewise have water and hydronium, which are likewise related by the one H plus. For this reason water and also H3O plus room alsoa conjugate acid-base pair. You can probably tell from the name, but whenever you have actually aconjugate acid-base pair, one point in the pair will certainly be one acid, and the other thing will constantly be a base. The meaning of which one is the acid and also which one is the base originates from the Bronsted-Lowry meaning of acids and also bases. Therefore the Brondsted-Lowry an interpretation says something that have the right to donate one H plus, therefore anything that will giveaway one H plus is one acid. So we deserve to see that, in this case, ours hydrofluoric acidis acting together the acid in the conjugate acid-base pair. And that method that fluoride has to be acting as the base. And also that provides sense, due to the fact that the Bronsted-Lowry meaning of a base is something that will certainly accept an H plus. And that's exactly what the does in the reverse reaction. Her F minus will pick increase an H plus and also go back to her acid. So us can also look at water and also H3O plus. Therefore here, water is gaininga proton, or accepting it, therefore water is acting together a base. And in the reverse reaction, H3O add to is donating a proton, for this reason H3O plus is acting together an acid. The relationship betweenconjugate acid-base bag we deserve to write a tiny bit more generally. So, if us representany generic acid as HA. Therefore this is ours acid. We said that a acid issomething the donates a proton. Therefore it'll lose the proton, and when that does that, itwill kind the conjugate base, i beg your pardon is stood for by A minus. In the reverse reaction,our base, A minus, can gain a proton and also remake our acid, or conjugate acid. For this reason whenever you have two types that have actually basically the exact same formula, which us abbreviated here as A minus, other than for one has actually anH plus and one doesn't, climate you know you have actually aconjugate acid-base pair. So let's look in ~ some more examples that conjugate acid-base pairs. We witnessed above, HF, or hydrofluoric acid, it's conjugate base is F minus. So right here HF is our acid, andwhen that loses the proton, we room left through F minus. We saw in the exact same reactionthat water can act as a base. Therefore if water is ours A minus, if that water accepts a proton, it forms the conjugate acid H3O plus. For this reason the instance we've gone v so far, HF, is for a weak acid. But we can also talk about the conjugate base of a solid acid, like hydrochloric acid. HCl is a solid acid, therefore that way it completely dissociates. Therefore it gives away every one of its protons, and also when the does that, we're left with theconjugate base, chloride. So even though chlorideisn't particularly basic, it's still the conjugate base of HCl. And also last but not least, we're gonna go through two examples where the looks choose we might havea conjugate acid-base pair, however we actually don't. So one example is, whatabout the relationship in between H3O plus and OH minus? If us think that our mountain up right here being H3O plus, if we lose one proton, we experienced that that is conjugate base is water. If water loses anotherproton, we acquire OH minus. For this reason the distinction betweenthese two varieties here is 2 protons instead of one proton. So these two, hydronium and hydroxide room not a conjugate acid-base pair because they different by twoprotons rather of one. And also then the lastexample we'll look in ~ is, we said that fluoride isa conjugate base of HF. Therefore what around the relationship in between sodium fluoride and fluoride? and so these two are alsonot a conjugate base pair because if us take our fluoride ion, and also it accepts a proton, us don't acquire sodium fluoride. Castle are connected by a salt ion. For this reason by definition, this two space not a conjugate acid-base pair.


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So in this video, we learnedthat a conjugate acid-base pair is when you have two types and they have the very same formula, except one has actually an extra proton. For this reason the acid has an extra proton, i m sorry it have the right to lose to kind the base.