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user18181818

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i think it's correct
for the flame test between ba and ca don't you need to boil it or something because u can't do a flame test with them in ppt forms
 
Masaken

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SadCeliac said:
Shocker 😭 why does everyone think I'm gay
Self explanatory question but I'm still asking

View attachment 41115
Can anyone confirm if this elimination sequence is correct - HSC 2020 Chem paper
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cation looks correct but tbh you could've just said flame test without having the na2so4 bit since the three cations produce three distinct results (the colours of ba2+ and ca2+ and then you just say magnesium doesn't form a distinct colour). for anion, it's not AgOH that forms the precipitate - AgOH is formed but it's not stable so it decomposes into silver oxide (silver oxide is the brown precipitate you see) so you'd need to acknowledge that. Ag+ also forms a (white) precipitate with Cl- so you'd have to acknowledge that too but apart from that everything else looks fine
 
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user18181818 said:
i think it's correct
for the flame test between ba and ca don't you need to boil it or something because u can't do a flame test with them in ppt forms
Click to expand...
they're all solutions though (specifies it's 0.1 mol/L at the start) so there's no ppt involved between ba2+ and ca2+
 
SadCeliac

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user18181818 said:
i think it's correct
for the flame test between ba and ca don't you need to boil it or something because u can't do a flame test with them in ppt forms
Click to expand...
Ok I'll keep that in mind - flame test the ions - got it

Masaken said:
cation looks correct but tbh you could've just said flame test without having the na2so4 bit since the three cations produce three distinct results (the colours of ba2+ and ca2+ and then you just say magnesium doesn't form a distinct colour). for anion, it's not AgOH that forms the precipitate - AgOH is formed but it's not stable so it decomposes into silver oxide (silver oxide is the brown precipitate you see) so you'd need to acknowledge that. Ag+ also forms a (white) precipitate with Cl- so you'd have to acknowledge that too but apart from that everything else looks fine
Click to expand...
Okay yeah I didn't know that, and I kinda ignored the AgCl ppt because it was the final thing anyways... Also I forgot the colour lol (white yeah?)

THANKS GUYS <3 🤩
Good to know I've memorised the colours of ppts basically fully correctly
 
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user18181818

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Masaken said:
they're all solutions though (specifies it's 0.1 mol/L at the start) so there's no ppt involved between ba2+ and ca2+
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yeah but then he's adding sulfate to it to make a ppt right? or you could take a new solution and do the flame test
 
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carrotsss said:
idk my english teacher seems like extremely confident ill b6 - she reckons im gonna get the second highest hsc mark in my yeargroup (we usually get 4-6 b6 for context) which is nice but idk if it’s like a false confidence
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How are you like almost SR in like every STEM subject there is and then are suddenly crazy at English as well?
 
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