@nhnct21 the statement " based on the equation for the overall cell reaction and the information
above" makes me think that nernst wasnt the justification they wanted. Based on the equation, the decrease in P(O2) is kind of like a limiting reactant. Idk, maybe im crazy though
@michelle426 that was my logic but im kinda confused how it would fit in with the rate law
@CanisMajor At the half equivalence point, pH is always = pka, and pOH is always = to pkb.
Examine the Henderson Hasselbach equation: ph = pka + log(base/acid).
At half equivalence, [base] = [acid], so ratio = 1, and log(1) = 0. Therefore, ph= pka.
Also by henderson hasselbach, we have pOH = pkb + log(acid/base). by the same logic, pOH = pkb.
Therefore, what you calculated was actually the pOH, when you wanted pH.
I understand that the curve does not match what the actual curve should look like, but you cannot ignore the information in the question with the ka. If anyone disagrees, please expain why.
@michelle426 @pillowspillows i don’t think thats true because the question said that it was first order with respect to bleach and the total reaction was first order, making food coloring zero order, and ultimately not affect the reaction
@michelle426: Dang, careless mistake again.
GUYS I FAILED THE FRQ YAY
@Mochis1 - I promise that your FRQ score is not as atrocious as mine.
@baller55 umm in the part right before it , you re supposed to find teh order with respect to food coloring, and since the second graph is linear, the rate equation is first order in both reactants, making the anwer temperature.
@eeqeqqe Agreed, you’ll never convince everyone though. 
@baller55 Part a) of that question specifically asks for order in respect to food coloring though
damn you’re right lol i misread so many questions because i was so nervous
@baller55 where does it say that? They NEVER mentioned that the reaction is first order overall. And if you had known a thing or two about kinetics, you would’ve recognized the graphs graphing absorbance of the food coloring, and that the reaction was first order in respect to food coloring. Also, since bleach is in CONSTANT concentration, when you add more coloring, the bleach now has even more molecules to react with, slowing down the reaction.
I just realized how stupid I was when I got nervous during the FRQ (and with low sleep)
My thoughts of getting a 3 are now demolished
@glasshours Mine was the worst, I promise.
@baller55 The question never said that the overall reaction order was 1. “The reaction is known to be first order with respect to bleach” and the previous quesstion it is established that blue dye order is 1
Haha it’s ok I feel you, I messed so many stupid little things up with the FRQs so I’m hoping my MC is strong enough to help a brother out but I guess I’ll just have to wait.
I’m praying for a large curve xD
So what’s the consensus on the “missing questions”? Were they actually not there (cuz I sure didn’t see 3f) or did a lot of people not pay enough attention?
what is the indicator used in the titration question?
Increasing concentration of dye just made logical sense to me, youre trying to keep it from reaching absorbance, which means colorless products, so how would adding more of the stuff that is the thing absorbing the light not help?
@pillowspillows yes, it does seem odd for the rate law doesn’t it? But let’s regard the other options: increasing the temperature and increasing the bleach. Increasing temperature will ALWAYS increase rate, so that’s out. The bleach was the main thing speeding up the reaction, so adding more of it would not slow anything down. However, the question did mention that the bleach was held constant throughout a standard reaction, and if you just added more coloring, it would take a longer time for the bleach to react with it all. It seems strange yes. But it makes sense.