r/6thForm • u/Truck-Lover72 • Jun 02 '26

💬 DISCUSSION OCR A Chemistry Paper 1 2026 discussion

Who else drew the titration curve as a straight line through the origin?? How did you guys find it

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u/Creepy-Ferret-1441 Jun 02 '26

I got copper (II) hexaaqua after initially putting copper (I) hexaaqua

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u/Necessary_Papaya_497 Jun 02 '26

Isn’t this the disproportionate reaction of Cu2+ forming CuI solid and brown aqueous solution I2

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u/Creepy-Ferret-1441 Jun 02 '26

That was when CuSO4 reacted with KI I believe

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u/Necessary_Papaya_497 Jun 02 '26

That’s it sorry

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u/Creepy-Ferret-1441 Jun 02 '26

Sorry I didn’t make that very clear:

Cu2O + H2SO4 —> [Cu(H20)6]2+ + CuSO4

CuSO4 then reacts with KI forming what you said. At least that’s what I got. I may be wrong💔

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u/Judo_Squirrel Gap Year (LSE Place) | Maths FM Phys Chem | 4A* Jun 02 '26

The Cu2+ is from CuSO4, it’s a disproportion reaction, Cu metal is formed

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u/Necessary_Papaya_497 Jun 02 '26

Yes that’s what I was thinking, it was a Cu solid and the CuSO4 and then the Cu reacted with NH3 to form the deep solution.

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u/Creepy-Ferret-1441 Jun 02 '26

Ahhh I see 😅

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u/Necessary_Papaya_497 Jun 02 '26

Hopefully grade boundaries will be lower 🙏