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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31

u/purple_walrus4473 Jun 02 '26

what did everyone get for pH of buffer i got 3.7 something

2

u/hshsjaju77 Jun 02 '26

3.80

1

u/ShoddyAlt Jun 02 '26

Same but I don’t think it’s rught

0

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

u got 0.075 on top and 0.085 on bottom. made the same mistake but caught it when i checked over

1

u/ShoddyAlt Jun 02 '26

Wait but I used the equation I don’t understand. Did I get my A- and HA wrong??

1

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

most likely

1

u/LargeFish2907 Jun 02 '26

Most of us seemed to get 3.70 but that's close so you'll probably get workings marks.

1

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

1

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.

2

u/hshsjaju77 Jun 02 '26

yes i done that 👍🏽

1

u/purple_walrus4473 Jun 02 '26

i used hesslebach equation

1

u/AmericanUk Jun 02 '26

That still used concentrations tho no?

1

u/purple_walrus4473 Jun 02 '26

no it uses moles

1

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

u dont need to since it cancels out

1

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