Campion College
6B Chemistry
`
Laboratory
Name: Jaden Small
Experiment No. :
Date: 21/04/21
`
Skill: O/R/R
Topic: Qualitative Analysis-Reactions of Some Cations and Anions
Aim:
To determine the cations and anions present in a solid mixture.
Title of Table: TABLE SHOWING QUALITATIVE RESULTS OF PARTICULAR CATIONS AND ANIONS
IN SM 2
Expt Procedure
1
Shake a solid mixture,
SM 2, with 10cm3 of
distilled water in a
stoppered boiling tube
for 2 minutes and then
filter.
2
Remove the filtrate and
then wash the residue
with distilled water. Use
the residue with
distilled water. Use the
residue for tests in 6 to
9
Treat separate 1 cm3
portions of the filtrate,
S1, as follows:
Then add dil. HCl (aq) to
the mixture
Add Barium chloride
solution;
Observation
White Precipitate
Inference and Equation(s)
Solid Mixture partially
dissolves solution therefore it
is either a carbonate or
hydroxide which is insoluble
and a soluble salt containing a
halide or sulphate ion
Colourless Solution
White Precipitate
SO42- present
Precipitate is BaSO4
Ba2+(aq) + SO42-(aq) → BaSO4
Expt Procedure
3
Add aqueous sodium
hydroxide drop by
drop;
Observation
White Precipitate
Inference
Al3+, Pb2+,Zn2+,Ca2+,Mg2+ present
then in excess
Does not dissolve
Ca2+,Mg2+ present
Add aqueous
ammonia drop by
drop;
White Precipitate
Al3+, Pb2+, Zn2+, Mg2+ present
then in excess
Does not dissolve
MgSO4(aq) + 2NH3(aq) + 2H2O(l) →
Mg(OH)2(s) + (NH4)2SO4(aq)
4
Precipitate is Mg(OH)2
5
6
7
Tests on the residue,
R1
Add dil. HCl directly
to the residue in the
filter paper and
collect the liquid that
runs through.
Divide the liquid into
2 portions and use
separate portions for
tests 7-8 below
Add aqueous sodium
hydroxide drop by
drop;
Effervescence
CO32- present
2H+(aq)+ CO32-→CO2(g)+ H2O(I)
White Precipitate
Al3+, Pb2+,Zn2+,Ca2+,Mg2+ present
then in excess
Does not dissolve
Ca2+,Mg2+ present
Add aqueous
ammonia drop by
drop;
Colourless solution
Ca2+ present
then in excess
Remains the same
S 1 contains the cation Mg2+ and the anion SO42-
R 1 contains the cation Ca2+ and the anion CO32-
SM 2 contains the soluble salt MgSO4 and the insoluble salt CaCO3