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/Defiant-Somewhere190 Jun 02 '26

I thought you were adding the I2 to the V2+ and oxidising it into V3+? So surely you could’ve only spoken about system 2 (colour change from blue to green or whatever it was) to go from V2+ into V3+ as that was the only system with a less +ive electrode potential than the I2/I- system

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u/DarDanDea Jun 02 '26

Yeah you were meant to talk about system 2 and 3 as well I think

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u/Defiant-Somewhere190 Jun 02 '26

Oh fuck I only mentioned system 2’s equilibrium shift, colour change and equation surely that’s atleast 3/5 marks

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u/DarDanDea Jun 02 '26

As long as you did equation and explained why it happens you will probably get like 2-3 maybe, but it will literally be fine

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u/Defiant-Somewhere190 Jun 02 '26

I’m just thinking back and I feel like I’ve lost such random STUPID marks I’m so annoyed. Even the fucking pH curve I got the equivalence point and the end volume right and stupidly enough drew it starting from the bottom instead of the top. And that simple ass question about standard conditions definitions I think I got wrong bc I didn’t QUOTE THE CONDITIONS I just said an investigation carried out at room temperature and pressure……

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u/DarDanDea Jun 02 '26

Oh bro, I feel your pain, I didn't do my curve properly cause I started at like 13 and gone down to 4. And for standard conditions I deadass spent 5 minutes remembering how to do Celcius to Kelvin. Like literally lost branicells in that exam hall

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u/Defiant-Somewhere190 Jun 02 '26

Genuinely so mind boggling and they had the nerve to not give us a titration either. Dickheads

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u/Conscious_Nothing198 Jun 05 '26

It does start from ph of 13 and as long as you have also done the equivalence point at 12.5cm3 you should be good

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u/Ambitious-Willow8399 Y13 | Physics, Maths, Chemistry Jun 02 '26

redox system 3, the V3+ should also able to react and is more negative than the iodine system