5

Buffer solution is 0.155 M in Na,HPO4 and 0.200 M in , Kj] 4.2*10-23 NaHzPO4 For HaPOa Kai = 7.5*10 3 Kaz =6.2*10-8What is the pH of this buffer solution? [Select ]...

Question

Buffer solution is 0.155 M in Na,HPO4 and 0.200 M in , Kj] 4.2*10-23 NaHzPO4 For HaPOa Kai = 7.5*10 3 Kaz =6.2*10-8What is the pH of this buffer solution? [Select ]

buffer solution is 0.155 M in Na,HPO4 and 0.200 M in , Kj] 4.2*10-23 NaHzPO4 For HaPOa Kai = 7.5*10 3 Kaz =6.2*10-8 What is the pH of this buffer solution? [Select ]



Answers

Find the $\mathrm{pH}$ of a buffer that consists of 0.12$M$ boric acid $\left(\mathrm{H}_{3} \mathrm{BO}_{3}\right)$ and 0.82 $\mathrm{M}$ sodium borate $\left(\mathrm{NaH}_{2} \mathrm{BO}_{3}\right)\left(\mathrm{p} K_{\mathrm{a}} \text { of boric }\right.$ $\mathrm{acid}=9.24 )$

The vision on Sarge Finding whining be It's these. Hey, it's easy. What do look get a bless Minus lo que less log. You do sold. Divide by their seat. B itch is equal to by putting values off a for 0.31 reply, then rest with the color seven. Bless log zero boy in through five. You know more. He's, you know, point drew 00 Well, so behave be it is equal to minus look into 4.3 Multiply 10 rents to the minus seven is 6.3 less look 0.250 divided by 0.2. Level zero is 0.9 The some of these value is 6.39 The value of PH is 6.39

So first question two parts are really the same name, but once an acid once based, so we'll treat them separately. And so for this first, when we have some acid which honestly, because kind of long to write out, I'm just gonna call it a J. Um and we're told that we have 0.12 Moller h. A. Put the concentration. A minuses 100 base is 1000.33 Moeller que of this acid is equal to 6.3 times sensing that you're fit. Now remember the equilibrium that describes that K describes his acid and water becoming H 30 plus and a minds. And so the mass action expression related to K is equal to the concentration of age 30 plus times a concentration of a minus over the concentration of H A. And since we're given this this and this, it's really easy to find the concentration ratio. Plus, we plug in 0.33 We plug in 0.12 6.3 times sense negative fifth and you'll find with the conservation vegetable pluses. Now the pH is that we're looking for, and the pH is the negative. Log the concentration of HBO plus. And when you do that, you're gonna get that pH is 4.64 Great. Next one, we have NH three and then it's crunch did acid and age form. And plus, in the following concentrations, we have 0.153 Moeller and 0.408 Mueller. Now, uh, this is different now because we have a base here, seven acid And so we has a K B that governs his behavior and that K b could be looked up its 1.8 time sensitive fit. Now, however, K B refers to this reaction and h three plus water with the imagery acting as a basic getting a proton from the water so becomes at age four. Plus you see one more Haijun plus hydroxide. It's acting as a basis for me hydroxide. Now, from this, we can say what the mass action expression for this K B is gonna be giving the concentration of NH four plus times a concentration of O H minus over the concentration of an age three and so we can plug in what we're given. We have t b um, we have NH four. Plus, that's, uh, 40.408 Uh, apartment. That's 0.153 Got to be careful with those sorts of things cities in a state to make and mess up your answer. But either way, you're going to get the concentration of O. H minus. Now, if you remember the concentration of O. H minus times a concentration of HBO plus is equal to 10th and 14th. It's a really important fact to know that relates to the auto ionization of water. And so once we have the Constitution of the H minus, we can find the conservation vacio plus which, like above, can be used to find the pH, which is because the negative log of the concentration of a studio plus and when you do that, you're gonna find the pH equals 9.68 which is what we should expect because we're dealing with the base here, and it's in larger concentration in this country

By putting the vision for finding its It's easy to do minus law que a less look in Do a seat. Do it by base, so we have the values minus log. Milieu of gain is 6.3 month supply. 10. Race to the barber minus eight. Bless log 0.0 divided by 0.110 Be it Easy girl 7.2 plus zero point 30 The some of these values is equal to save 1.5 the really well ph. East seven.

This problem is simply a buffer solution. PH calculation Where we used to Henderson Hassle Baulch equation to solve for pH. So pH is going to be equal to p k of the acid in this case given to us at 2.90 plus the log of the moles of base. The moles of base can be calculated by taking the volume of base multiplied by its concentration, divided by the moles of acid, which can be determined by taking the volume of acid in leaders multiplied by its concentration, and we get a pH of 3.0


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