OCR A-Level Chemistry B Paper 2 (H433/02) - 19th June 2023 [Exam Chat]

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Yes it’s the hardest one I’ve done so far.

What everyone get for the percentage purity, I got 33. Also for the hours I got around 500

for percentage purity i got 80.1%
i got 321.6 hours for the hydrogen thing which ik is defo wrong
and i got 4.76 x 10^-6 for Kc

Original post by hello83

What everyone get for the percentage purity, I got 33. Also for the hours I got around 500

For the purity I got 79% and for the hours I got 5.4.

Original post by gwall3r2005

Thought it was a good paper, the pre release article questions were really nice. Some weird questions overall tho, E.g. the ‘what advice would you give’ re recrystallisation.

What did you think?

I calculated the yield using moles from previous q and it was over 100% so I said try the recrystallisation with an organic solvent to get rid of organic impurities. Sounds quite right to me but idk

Original post by alligathor6

I calculated the yield using moles from previous q and it was over 100% so I said try the recrystallisation with an organic solvent to get rid of organic impurities. Sounds quite right to me but idk

I did the same thing. can’t remember my answer though

Original post by hello83

What everyone get for the percentage purity, I got 33. Also for the hours I got around 500

80.1% and 5.36 hours

What did people get for the Kc question

Original post by sy.lv.ie

What did people get for the Kc question

4.76 * 10^-7 mol^2dm^-6

Original post by alligathor6

80.1% and 5.36 hours

I got 10.7 and I was wondering what everyone did about mols and stuff

Original post by Sophiew004

I got 10.7 and I was wondering what everyone did about mols and stuff

I found the moles of hydrogen (10) and doubled it cuz hydrogen to electron ratio was 1:2. Then I multiplied 96500 by 2 divided it by 100 and 3600

Original post by alligathor6

I found the moles of hydrogen (10) and doubled it cuz hydrogen to electron ratio was 1:2. Then I multiplied 96500 by 2 divided it by 100 and 3600

I think there was 20 mols idk tho

Original post by Sophiew004

I think there was 20 mols idk tho

yeah yeah it was 20, I just didn't type in the 0 lol

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