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#Post#: 137--------------------------------------------------
Problem of the week-8/7/12
DIR By: Michel
Date: May 12, 2012, 6:06 am
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An oily liquid, A was produced by the complete reaction between
ammonium chloride and a liquid, B. The liquid, A was isolated
from the other products for analysis.
The other products of the reaction were dissolved in water, and
analysed, and the presence of a hydroxyl group was confirmed.
The solution was then evaporated and the flame test was carried
out on the salt obtained. A golden yellow color was observed.
When A was hydrolysed with water,and warmed gently, a pungent
smelling gas, C was evolved.30 ml of The solution left after
warming was placed in a test tube. 20ml of 2M H2SO4 was added .
A gas was evolved which was identified as Chlorine.
Identify A, B, and C.
What are the products obtained when A is completely hydrolysed
with an alkali?
#Post#: 361--------------------------------------------------
Re: Problem of the week-8/7/12
DIR By: Michel
Date: July 7, 2012, 4:18 am
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Be the first to solve this problem and get our unique problem
solver badge award
#Post#: 384--------------------------------------------------
Re: Problem of the week-8/7/12
DIR By: Chris
Date: July 12, 2012, 2:10 pm
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I have no idea :(
#Post#: 408--------------------------------------------------
Re: Problem of the week-8/7/12
DIR By: Jeffrey Chan
Date: July 19, 2012, 6:41 am
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Is C ammonia and A an amide?
#Post#: 409--------------------------------------------------
Re: Problem of the week-8/7/12
DIR By: Michel
Date: July 19, 2012, 7:17 am
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--- Quote from: Jeffrey Chan link ---
>
> Is C ammonia and A an amide?
>
--- End Quote ---
C is ammonia, A isn't an amide
#Post#: 410--------------------------------------------------
Re: Problem of the week-8/7/12
DIR By: Potla
Date: July 19, 2012, 8:20 am
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A=NCl3, B=NaOCl.
When NaOCl reacts with NH4Cl, it gives NCl3(the oily explosive
liquid) and NaOH+HCl, namely NaCl+H2O.
On evaporating the NaCl(aq) we get NaCl, which gives yellow
flame test.
On hydrolysis Nitrogen Trichloride liberates NH3 and HCl. The
Chloride ion gives positive H2SO4 test and liberates Cl2.
Complete hydrolysis of NCl3 with alkali (OH-) gives NH3+Cl-+H2O.
#Post#: 412--------------------------------------------------
Re: Problem of the week-8/7/12
DIR By: Michel
Date: July 19, 2012, 8:31 am
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Congrats Potla! You are correct.
A is NCl3 and B is NaClO
On the hydrolysis of NCl3,
HOCl is produced which liberates chlorine with sulfuric acid.
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