DIR Return Create A Forum - Home
---------------------------------------------------------
Chemistry:The Central Science
HTML https://kolathechemist.createaforum.com
---------------------------------------------------------
*****************************************************
DIR Return to: General chemistry discussion
*****************************************************
#Post#: 1708--------------------------------------------------
Confirmation of ion
DIR By: Dean
Date: December 27, 2012, 4:12 pm
---------------------------------------------------------
How these ions can be confirmed present
Fe2+
Fe3+
CN-
NH2
OH-
please help me i know some of them but i dont know the equations
please writ eqn of reaction
thanks
#Post#: 1711--------------------------------------------------
Re: Confirmation of ion
DIR By: hkar19
Date: December 27, 2012, 9:27 pm
---------------------------------------------------------
actually dean, i cannot answer you in a full answer,
i am only have a hint: some confirmation use precipitation, some
using flame, some using titration (not just acid base).
from precipitate, we can obtain their ratio. with flame, we can
obtain their flame characteristic, just dunno with titration. :D
#Post#: 1717--------------------------------------------------
Re: Confirmation of ion
DIR By: Michel
Date: December 28, 2012, 4:52 am
---------------------------------------------------------
If you wish to be very sure about your results, in addition to
precipitation of hydroxides of Fe2+ and Fe3+,you may confirm the
presence of Fe2+ using potassium ferrocyanide. if you add a few
drops of potassium ferrocyanide and you get a dark blue ppt,
Fe2+ is confirmed present. you can also add a few drops of
potassium thiocyanate solution to the salt solution. formation
of a dark red solution of Fe(SCN)3 confirms Fe3+
#Post#: 1719--------------------------------------------------
Re: Confirmation of ion
DIR By: Michel
Date: December 28, 2012, 5:01 am
---------------------------------------------------------
--- Quote from: Dean link ---
>
>
> please help me i know some of them but i dont know the
equations please writ eqn of reaction
> thanks
>
--- End Quote ---
you can try writing the equations and then we may help correct
any mistakes
#Post#: 1746--------------------------------------------------
Re: Confirmation of ion
DIR By: Dean
Date: December 28, 2012, 2:45 pm
---------------------------------------------------------
Ok, what of CN- and NH2, how i confirm the ions?
#Post#: 1753--------------------------------------------------
Re: Confirmation of ion
DIR By: Michel
Date: December 29, 2012, 4:05 am
---------------------------------------------------------
when FeSO4 is added to a solution suspected of containing
cyanide and The resulting mixture is acidified with mineral
acid, The formation of Prussian blue is a positive result for
cyanide
i cannot remember any test for NH2 but probably the formation of
diazonium ion with nitrous acid and cold dilute HCl solution can
confirm the presence of NH2. Make a mixture of HNO2 and HCl at
0°C and see if diazo group is formed when your solution is
added. amines have a characteristic smell also.
#Post#: 1756--------------------------------------------------
Re: Confirmation of ion
DIR By: Shiva
Date: December 29, 2012, 5:00 am
---------------------------------------------------------
Amides releases Ammonia on hydrolysis very similar to Nitrides
and Ammonium carbonate. So, you can smell it as soon as you open
the box.
Shiva
#Post#: 1761--------------------------------------------------
Re: Confirmation of ion
DIR By: Michel
Date: December 30, 2012, 5:26 am
---------------------------------------------------------
In addition to all these...may I ask..what setting are we
looking at here? If you're in a school lab, I believe the
necessary reagents are provided. Perhaps telling us the reagents
you have would help a bit more
*****************************************************
Page 1 of 1