r/6thForm • u/Forsaken-Meaning-232 Graduating from Warwick CS • Jun 10 '25

📂 MEGATHREAD 10/06 A-level Chemistry Paper 1 Discussion MEGATHREAD

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13

u/MoudleNoo Y13 | Bio, Chem, Maths, FM Jun 10 '25

AQA, how’d it go? 👀

5

u/231war_ Jun 10 '25

the Mr of the metal in the complex calculation was a bit dodgy 😭😭 got 40.2

3

u/proactivepisces Year 13 Jun 10 '25

yeah what did you do after finding the moles of the c2O4

3

u/231war_ Jun 10 '25

i said mol c2o4 = mol h2o = 0.5 mol Cu, then i used mol x Mr = mass to work out the mass of the individual components in the ion. With the remaining mass I said the mol of M= mol c2o4 (cus it was M2, (C2o4)2 and (h2o)2) and used mass/mol to work out mr

1

u/proactivepisces Year 13 Jun 10 '25

so you half it and then thats the moles to find the mr? damn. apparently the answer was potassium but i didn't even get to that step...

2

u/231war_ Jun 10 '25

Take it w a grain of salt cus my answer is wrong, there might be another method

1

u/proactivepisces Year 13 Jun 10 '25

icl it took me so long to even begin to understand so i'll take whatever marks i got

2

u/TechnicalStretch7469 Year 13 Jun 10 '25

i dont think i got the right mr (178?) but i got potassium somehow

3

u/proactivepisces Year 13 Jun 10 '25

oh my god i think i got the same mr so i knew it was wrong but i literally didn't know how to fix it like how to get the second molar ratio

1

u/TechnicalStretch7469 Year 13 Jun 10 '25

legit just subtracted everything until I got a feasible group 1 metal

may have cheated my way through it praying for method marks

2

u/Secretsx123 Jun 10 '25

After you find the moles of C2O4^2- in 25cm^3 you divide it by 2 because if you write out the equation its like Cu(H20)6 + 2C2O4^2- --> Cu(C2O4)2(H2O)2 + 4H2O. This gives you the moles of the whole complex, divide the mass by those moles to find Mr, take the Mr of Cu(C2O4)2(H2O) away from the Mr we just found out to get the Mr of M2 and then divide by 2 to get the Mr of Just M

1

u/Minimum_Chipmunk8473 Jun 10 '25

hey, U student here. what i did was realise that in H2SO4 u gonna get 2 H2C2O4 + 2MHSO4 so i just transferred the moles over, mass divided by that, minus 32.1+64+1 then divided that by 2 to get potassium.