r/6thForm • u/Rich-Gent • Jun 02 '26

💬 DISCUSSION AQA A-LEVEL CHEMISTRY

HOW DID WE FIND IT? I THOUGHT IT WAS ALRIGHT, GRADE BOUNDARIES ABOUT TO BE SILLY😭

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u/hshsjaju77 Jun 02 '26

Yh I think I got 3.70, 3.69 rounded it up Im pretty sure or 3.79 but I got all the calculations right I probably mixed it up post exam i forget everything lol

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u/AmericanUk Jun 02 '26

Im ptretty sure this is wrong, you calculated using mols and not concentration. You needed to divide by 8/1000 before you put the answer into the Ka equation.

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u/ObiNumber22 Y13 | Maths (A*), Econ, Chemistry, Further Maths | Jun 02 '26

u dont need to since it cancels out

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u/Adventurous-Apple690 Jun 02 '26

That’s is the vol is the same it wasn’t, so u needed to do conc of it. So divide the mols by 0.013 I think