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 waec chemistry practical question & answer 2012.

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blessingsmart
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PostSubject: waec chemistry practical question & answer 2012.   03/04/12, 10:50 pm

> QUANTITATIVE ANALYSIS <
TEST
Solution C + aqueous NaOH + Heat
-----------------------
Portion of Solution C + BaCl2 + dil. HCl.
-------------
Portion of Solution D + NaOH in drops. Then in excess.
----------
Portion of Solutio D + NH3(aq) in drop then iq excess.
--------
Portion of Solution D + HNO3 + AgNO3 solution.
---------
Mixture frm above + HNO3 in excess.
------
OBSERVATIONS
Evolution of colourless gas with characteristics choking smell which turns moist red litmus paper blue and form white foam with conc. HClacid vapour.
-----------------
white ppt insoluble in dilute HCl
--------
Reddish brown ppt insoluble
----------
Reddish brown ppt insoluble
--------
White ppt insoluble
--------
White ppt dissolved to give a colourless solution.
-----------------
INFERENCE
NH3 gas from NH4+ is present.
-------
SO42-, SO32-, CO32- are present
--------
Fe3+ is present
-------
Fe3+ is present
--------
Cl- ion is present
------
Cl- ion is confirmed.
(N.B u write a test scroll to its observation and then its inference. 'cos itis to be written in tabular form i.e make a 3columns: then write
TEST| OBSERVATION|INFERENCE.) ,
====================
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sanya
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PostSubject: Re: waec chemistry practical question & answer 2012.   03/04/12, 11:32 pm

Pls,were is question and answers..pls arrange it
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Precious4luv
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PostSubject: Re: waec chemistry practical question & answer 2012.   04/04/12, 12:39 am

good work, but what abt d VOLUMETRIC ANALYSIS. and how sure is this. Can we see d questions.
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Izuucelestine
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PostSubject: waec questions   04/04/12, 07:09 am

pls i need waec practical questions:mali pls
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mali
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PostSubject: Re: waec chemistry practical question & answer 2012.   04/04/12, 08:15 am

i will post main papers
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Aboderin Opeyemi
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PostSubject: Re: waec chemistry practical question & answer 2012.   04/04/12, 01:47 pm

Pls wat of govt?
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Dannyoung
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PostSubject: Re: waec chemistry practical question & answer 2012.   04/04/12, 05:40 pm

Ples i need biology obj an essay
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blessingsmart
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PostSubject: Re: waec chemistry practical question & answer 2012.   07/04/12, 04:46 pm

The true biology specimen is available and question and answer.
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Chocboi4real
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PostSubject: Re: waec chemistry practical question & answer 2012.   13/04/12, 08:24 am

blessingsmart wrote:
> QUANTITATIVE ANALYSIS <
TEST
Solution C + aqueous NaOH + Heat
-----------------------
Portion of Solution C + BaCl2 + dil. HCl.
-------------
Portion of Solution D + NaOH in drops. Then in excess.
----------
Portion of Solutio D + NH3(aq) in drop then iq excess.
--------
Portion of Solution D + HNO3 + AgNO3 solution.
---------
Mixture frm above + HNO3 in excess.
------
OBSERVATIONS
Evolution of colourless gas with characteristics choking smell which turns moist red litmus paper blue and form white foam with conc. HClacid vapour.
-----------------
white ppt insoluble in dilute HCl
--------
Reddish brown ppt insoluble
----------
Reddish brown ppt insoluble
--------
White ppt insoluble
--------
White ppt dissolved to give a colourless solution.
-----------------
INFERENCE
NH3 gas from NH4+ is present.
-------
SO42-, SO32-, CO32- are present
--------
Fe3+ is present
-------
Fe3+ is present
--------
Cl- ion is present
------
Cl- ion is confirmed.
(N.B u write a test scroll to its observation and then its inference. 'cos itis to be written in tabular form i.e make a 3columns: then write
TEST| OBSERVATION|INFERENCE.) ,
====================
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View user profile http://www.dotime.choc.ro
 

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