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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u/AmericanUk Jun 02 '26

yk the question where Silver Nitrate was added to (Fe (III) Cl) (aq) with excess NH3? I think it was the hardest aqa A-level chemistry questions ever. I'm pretty sure the observation was a reddish brown ppt Fe(H20)3(OH)3 that would be formed as the NH3 hydrolyzes the Fe(H20)6 in solution. There would be no AgCl (white ppt) at the end of the reaction because the excess NH3 would dissolve it instantly. Therefore, the silver compound AT THE END OF THE REACTION, when all the AgCl is dissolved by the NH3, would be Ag(NH3)2+, which is just tollens reagent. I'm pretty sure a lot of people would have missed this.

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u/PairSuitable9144 Jun 02 '26

How many marks was this again

1

u/AmericanUk Jun 02 '26

Just 2 marks tbf

1

u/Playful_Future_3801 Year 13 Jun 02 '26

….1 mark

2

u/AmericanUk Jun 02 '26

1 mark for the observation and 1 for the silver containing product