OCR A2 CHEMISTRY F324 and F325- 14th and 22nd June 2016- OFFICIAL THREAD

Is K2SO4 (aq) the same as 2K+(aq) + SO42- (aq)

i think generally the exam was good however i think that there were some sneaky parts that you could have lost marks on

Is K2SO4 (aq) the same as 2K+(aq) + SO42- (aq)

Didn't they add 20cm^3 of 0.0270 mol of NaOH to 100cm^3 of water, so the total volume would be 120cm^3? That would make [NaOH] = 0.0054/0.120 = 0.045

I may well be wrong here.

yeah i got that, haven't seen anyone else say they got this yet though

no.

I can't believe people actually have the time to be on here arguing over how much revision someone may or may not have done. You've done the bloody exam, and 7 hours later you're still talking about this. Someone just make an unofficial mark scheme already. It didn't take this long for one last year.

Yes, they are the same thing! They're both allowed (I'm 99.9% sure).

I've never seen it being allowed in a mark scheme.

Just going to throw out some numbers that are on my calculator and see if they ring a bell with anyone:

2.9 x10^-2
-1099
104
2.12
3.43
13.03
10.68

Anyone recognise these?

i did 0.05-0.04 so 0.01 for H+ and 0.04 for A- in buffer calculation, how many marks wud i lose?

No need for this dude, we're all A level chemists, no one who's made it here is bad at chemistry. Everyone's just finished an exam today, try and understand that for some people it didn't go as well as it could have done at no fault of their own.

1 or 2 at most; you'd get follow on marks.

h

So we'll assume you're going to Oxford/Cambridge then. Happy for you. In the mean time stop shutting others down as a way to fuel your own ego. Everyone on this thread has studied chemistry- everyone has a topic they like and others they hate. The paper might have been jam packed full of your favourite topic, yet equally filled with someone else's nemesis. No one is grateful for your comment so keep it to yourself

1 or 2 at most; you'd get follow on marks.

hey do you remember the correct salt and acid moles/concs?

I'd like to add that this paper was deceptively easy. I go to a grammar school and there's one question that pretty much everyone I've talked to got wrong, even though they thought they got the correct answer at first.

I predict ~ 75 for an A and 83 for A*