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In which of these reactions in aqueous solution, does a precipitate form?

a bit confused :s-smilie:
there can be more than one answer

options are:
Be(OH)2 + XS NaOH
AlCl3 + XS Na2CO3
CuSO4 + XS NH3 (aq)
SiCL4 + XS H20




P.s can NH2- behave as a ligand? i know that Nh3 can...
Original post by Thisisj
a bit confused :s-smilie:
there can be more than one answer

options are:
Be(OH)2 + XS NaOH
AlCl3 + XS Na2CO3
CuSO4 + XS NH3 (aq)
SiCL4 + XS H20



AlCl3 + XS Na2CO3

is the only one
Reply 2
Original post by charco
AlCl3 + XS Na2CO3

is the only one


are you sure??
because the options are
(1,2,3)
(1,3)
(2,4)
(4 only)
There is no option with 2 only ...
Original post by Thisisj
a bit confused :s-smilie:
there can be more than one answer

options are:
Be(OH)2 + XS NaOH
AlCl3 + XS Na2CO3
CuSO4 + XS NH3 (aq)
SiCL4 + XS H20




P.s can NH2- behave as a ligand? i know that Nh3 can...


nh2 does have a lone pair
yes nh2 can behave as a ligand eg h2nch2ch2nh2 but it acts as a bidentate ligand so the ligand donates 2 lone pairs of electron to the central metal ion
Original post by Thisisj
are you sure??
because the options are
(1,2,3)
(1,3)
(2,4)
(4 only)
There is no option with 2 only ...


In that case they are probably counting silicic acid as a ppt:

SiCl4 + 4H2O --> H4SiO4 + 4HCl

It's a funny one because it forms a gel like structure...
Reply 5
Original post by hahaff
nh2 does have a lone pair
yes nh2 can behave as a ligand eg h2nch2ch2nh2 but it acts as a bidentate ligand so the ligand donates 2 lone pairs of electron to the central metal ion



Original post by charco
In that case they are probably counting silicic acid as a ppt:

SiCl4 + 4H2O --> H4SiO4 + 4HCl

It's a funny one because it forms a gel like structure...


Thanks

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