Qualitative Analysis of R
Module: 3
Skills tested: ORR, A&I
Solid R contains one cation and two anions.
INSTRUCTIONS: Complete the table below, performing the tests listed and add
the observations and inferences for each test.
Tests
Observations
1. Describe solution R
Clear colourless liquid
2. Use a 2cm3 sample of
Dropwise – Turned from a
clear coloured liquid to a
white cloudy liquid.
solution R and add
aqueous sodium
hydroxide slowly until in
Excess – Turned from cloudy
white liquid back to colourless
liquid.
excess
3. Repeat step 2 using
aqueous ammonia
instead of sodium
Dropwise – Turned from clear
colourless liquid cloudy white
liquid. Is a bit cloudier than
the solution with NaOH.
hydroxide solution
Excess – Remains a cloudy
white liquid.
4. To a 2 cm3 sample of
Dropwise – Remains clear
colourless liquid.
solution R add a small
amount of potassium
Excess – Remains clear
colourless liquid.
iodide solution
5. Use a 2cm3 sample of
solution R and add a
small amount of dilute
When HNO3 was added
solution remained a clear
liquid but when BaCl was
added solutioned turned a
chalky and powdery white
solution
Inferences
nitric acid, then aqueous
barium chloride solution.
6. Use a 2 cm3 sample of Turned from clear liquid to
solution R and add a
small amount of silver
nitrate solution followed
by aqueous ammonia.
cloudy white solution.
(AgNO3). When ammonia
(NH3) was added cloudy
white solution was formed
with solid white precipitate
being formed at the bottom of
the test tube (from silver
nitrate AgNO3)
Cation present in R………….
Anions present in R……………..