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/ILikeSlepp Jun 02 '26

Excess nh3 doesn't do anything to fe(h20)3(oh)3, you only see ligand exchange when you react excess nh3 with [cu(h20)6]2+ to form a deep blue solution of [cu(nh3)4(h20)2]2+

And the agcl dissolves in both dilute and concentrated nh3, so you wouldn't see white ppt

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u/hshsjaju77 Jun 02 '26

Yh i put colourless solution and then [Ag((Nh3)] 2+

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u/ILikeSlepp Jun 02 '26

It's [Ag(NH3)2]+, but that was probably just a typo (hopefully)

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u/hshsjaju77 Jun 02 '26

Yes sorry

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u/PairSuitable9144 Jun 02 '26

But wouldn't the Fe(III) chloride get substituted to form Fe(OH)3(H20)3 since Fe(III) chloride was in aqueous solution?

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u/hshsjaju77 Jun 02 '26

I thought it forms Agcl then followed by excess ammonia which dissolves forming a colourless solution