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#Post#: 2142--------------------------------------------------
Re: Inorganic qualitative analisys of cations test
DIR By: Michel
Date: February 20, 2013, 12:25 pm
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Great help Shiva!.... I was following this topic and I recently
got an inorganic chemistry text, going through a few pages makes
me feel my knowledge is a bit rusty! Good job shiva!
#Post#: 2148--------------------------------------------------
Re: Inorganic qualitative analisys of cations test
DIR By: Shiva
Date: February 21, 2013, 5:19 am
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Thank you guys. My pleasure :) Nothing like that Michel. All
learning something new everyday. You are great man and covered a
wide range of chemistry. But me only know Inorganic chemistry
lol :)
#Post#: 2166--------------------------------------------------
Re: Inorganic qualitative analisys of cations test
DIR By: Chemist@
Date: February 23, 2013, 1:36 pm
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How to determine phosphate and acetate anions in their
solutions?
#Post#: 2167--------------------------------------------------
Re: Inorganic qualitative analisys of cations test
DIR By: Shiva
Date: February 23, 2013, 1:54 pm
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well, like carbonates, only alkali phosphates & Ammonium
phosphate are soluble in water. Rest are insoluble. On adding
silver nitrate solution to phosphates, they will give a yellow
precipitate of Silver phosphate. Also, Ferric chloride gives
yellow precipitate with any soluble phosphate solution and
violet blue precipitate of Cobaltous phosphate with Cobalt
nitrate due to the formation of corresponding metal phosphates.
As far as acetates are concerned, all acetates have distinct
disagreeable odor and they will give dark coloration on adding
Ferric chloride solution due to the formation of Ferric acetate.
Shiva
#Post#: 2176--------------------------------------------------
Re: Inorganic qualitative analisys of cations test
DIR By: Chemist@
Date: February 24, 2013, 4:07 am
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Thanks again. I should've written that aside acetate and
phosphate I might get other anions - carbonate, sulfate,
chloride and nitrate.
EDIT: I was searching this a lot, so I have the following
question: What will happen when silver is added to a sulfate
solution? Will it precipitate? If yes, what is the color of the
precipitate?
Also, will acetate give the odor if dilute HCl is added, or I
need concentrated acids?
#Post#: 2185--------------------------------------------------
Re: Inorganic qualitative analisys of cations test
DIR By: Shiva
Date: February 24, 2013, 12:18 pm
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Yes, sulfates will give a white precipitate of Silver sulfate on
adding Silver nitrate. No, acetates have their own odor even
without adding any reagents. However, you will perceive a strong
odor of acetic acid on adding concentrated acids to acetates.
Shiva
#Post#: 2187--------------------------------------------------
Re: Inorganic qualitative analisys of cations test
DIR By: Chemist@
Date: February 24, 2013, 12:51 pm
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Thanks again. I will have to start making a new scheme now for
everything.
#Post#: 2260--------------------------------------------------
Re: Inorganic qualitative analisys of cations test
DIR By: Chemist@
Date: March 8, 2013, 11:43 am
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I got an idea about acetates. How easily are they precipitated
with AgNO3?
#Post#: 2261--------------------------------------------------
Re: Inorganic qualitative analisys of cations test
DIR By: Shiva
Date: March 8, 2013, 11:57 am
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Yes, It can be precipitated quite easily with Silver nitrate as
it is poorly soluble in water. However, as other anions of
Silver are mostly poorly soluble/insoluble in water, you may get
confused.
Shiva
#Post#: 2262--------------------------------------------------
Re: Inorganic qualitative analisys of cations test
DIR By: Chemist@
Date: March 8, 2013, 12:08 pm
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Thanks for the reply.
As I don't have many anions to prove, when I add AgNO3, I can
easily separate all the anions from the nitrate (if I don't get
a precipitate). That way I can prove the nitrate presence
without the scary brown ring test.
If I get a precipitate, yellow would mean phosphate, bubbles
when HCl is added would mean carbonate, precipitate with BaCl2
would mean sulphate and precipitate with Pb(NO3)2 would mean
chloride. If no of the listed reactions happen, I have the
acetate present.
What do you think about this way?
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