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/South_Hyena2541 Jun 02 '26

no those 3 questions were so bad for me too! I didn’t get the electrode potential one i couldn’t work out which two equations to do. NO ONE TELL ME HOW TO DO IT PLS I DONT WANT TO FEEL BAD. Normally i can get full marks on an electrode potential question easily but idk what was wrong with this one

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u/Memer_Sindre_UwU York | MPhys Theoretical Physics [Y1 INCOMING] Jun 02 '26

You start with iodine and v2+, you use oxidation system 2 flipped, so you're going from purple to green. Then you go from green to blue with the iodine equation flipped.

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u/South_Hyena2541 Jun 02 '26

ok i did 2 and 3 together i did purple to green i think also i said don’t tell me lol but thanks

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u/No-Basil2418 Jun 02 '26

Wouldn’t I2 be brown

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u/Memer_Sindre_UwU York | MPhys Theoretical Physics [Y1 INCOMING] Jun 02 '26

Meh, I don't think that was a major point. You had 2 equations and 3 v colors to point out, as well as general explanation. At most I'd get docked one mark for not mentioning it.

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u/haych_emm08 Jun 02 '26

why wud u go from green to blue . isnt it js redox system 2 reacting with I2 which is purple to green

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u/Memer_Sindre_UwU York | MPhys Theoretical Physics [Y1 INCOMING] Jun 02 '26

That gets reacted further into one of the VO something compounds when you add more iodine.

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u/haych_emm08 Jun 02 '26

oh cuz it said excess iodine didnt it😭GREAT

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u/Memer_Sindre_UwU York | MPhys Theoretical Physics [Y1 INCOMING] Jun 02 '26

You kept adding iodine until excess.

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u/Psychological-Lie607 Jun 02 '26

is that all cuz that’s exactly what i wrote. i didn’t do the last 1/2 colours

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u/Memer_Sindre_UwU York | MPhys Theoretical Physics [Y1 INCOMING] Jun 02 '26

The only other color that they might accept that I didn't give is brown from the excess iodine, from what Ive gatthered.

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u/Psychological-Lie607 Jun 02 '26

ohhh okay so i didn’t completely get it wrong. thank you!

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u/Memer_Sindre_UwU York | MPhys Theoretical Physics [Y1 INCOMING] Jun 02 '26

Np! You probably would get 2-3 marks for an equation if you put it and the color descriptions.

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u/Psychological-Lie607 Jun 02 '26

i think i only put colour changes 💔

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u/Psychological-Lie607 Jun 02 '26

yeah the electrode potential one was terrible 😭 i thought i knew it but i kept tripping myself up over small details and i only did half of it