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Title: Lab Experiment
Description: These notes are about one of the experiment performed at university level in chemistry.
Description: These notes are about one of the experiment performed at university level in chemistry.
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EXPERIMENT 1
THE PROBLEM OF 9 UNKNOWN SOLUTIONS
PURPOSE
The purpose of this experiment was to identify the nine unknown solutions by reacting
each solution with other solutions one by one
...
The solutions were also identified on the
basis of difference in the solubilities, chemical properties and the formation of precipitate and its
colour after formation
...
Each solution was reacted with the other solution
one by one by adding 10 drops of one solution and 10 drops of the other solution in a small test
tube
...
For the reaction between
solution 2 and 8 and between 6 and 9, the precipitate was not seen immediately
...
The result was recorded on the data sheet
...
Similarly if there was formation of precipitate after the reaction, then the
obtained colour of the precipitate formed was noted on the data sheet
...
(Reference 1)
RESULTS
According to the data recorded on the data sheet during the experiment, some solutions
on reaction formed precipitates
...
After reacting solution 1 and 2, a creamy white precipitate was
formed
...
On reacting
solution 2 with 5, 6, 8 and 9 the precipitates formed were black, brown, and white
...
On the basis of the colour of precipitate,
solution 1, 3, 4, 5, 6, 8, and 9 were found to be NaBr, KIO3, NH4Cl, Na2S, NaOH, Na2SO4 and
BaCl2
...
AgNO3(aq) + NaBr(aq)
AgBr(s) (white ppt
...
) + K+ + NO3-
AgNO3(aq) + NH4Cl(aq)
AgCl(s) (white ppt
...
) + 2Na+ + 2NO3-
AgNO3(aq) + NaOH(aq)
AgOH(s) (brown ppt
...
) + 2Na+ + NO3-
2AgNO3(aq) + BaCl2(aq)
2AgCl(s) (white ppt
...
e
...
These reactions are shown as followed
...
) + 2Na+ + 2ClBa(OH)2(s) (white ppt
...
) + 2Na+ + 2Cl-
By reacting solution 4 (NH4Cl) and solution 5 (Na2S), pale white/yellow precipitate was
formed
...
) 2Na+ + 2Cl-
Since KClO3 does not form any precipitate with any solution, therefore solution 7 was found to
be KClO3 according to the data recorded in the data sheet (attached at the end)
...
1
...
Solution 2: AgNO3
3
...
Solution 4: NH4Cl
5
...
Solution 6: NaOH
7
...
Solution 8: Na2SO4
9
...
Radhakrishnan T
...
U of T Edition: Mississauga; 2015; p 41-48
...
Toh S, McFarlane J, Tsouris S
...
Solvent Extraction and
Ion Exchange 24, pg 33-56, 2006
Title: Lab Experiment
Description: These notes are about one of the experiment performed at university level in chemistry.
Description: These notes are about one of the experiment performed at university level in chemistry.