CHEMISTRY FORM 4 | CHAPTER 6: ACID, BASE AND SALT
2cm3 sodium
sulphate
6.11 QUALITATIVE ANALYSIS solution
OF SALT – ANION TEST
Aim
Problem
stateme
nt
Hypothe
sis
Variable Manipulated :
s Responding :
Fixed :
Material Nitric acid, silver nitrate solution, hydrochloric acid, barium chloride solution, sulphuric
s acid, iron(II) sulphate, concentrated sulphuric acid, sodium carbonate solution, sodium
chloride solution, sodium sulphate solution, sodium nitrate solution, distilled water,
limewater.
Apparat Test tube, test tube rack, test tube holder, glass rod, dropper, rubber stopper with
us delivery tube, 100 cm3 beaker, 10 cm3 measuring cylinder.
Anion test
METHOD I : CONFIRMATORY TEST FOR CARBONATE ION, CO32-
Procedure Apparatus set up Remarks
1) Measure and pour ……………… Observation:
of ………………………………..
solution into a test tube. 2cm3
sodium Inference:
3
2) ………….. 2 cm of 1.0 mol dm -3
carbonate
solution
hydrochloric acid, HCl into the
test tube.
Ionic equation:
3) If effervescence occur, flow the
gas into limewater.
4) Record the observation.
METHOD II : CONFIRMATORY TEST FOR CHLORIDE ION, Cl-
1) Measure and pour ……………… Observation:
of ………………………………..
solution into a test tube.
2) ………….. 2 cm3 of 1.0 mol dm-3 Inference:
………………………… into the test
2cm sodium
3
tube. chloride solution
3) …………… 2 cm3 of 0.1 mol dm-3 Ionic equation:
………………………………………
into the test tube.
4) Record the observation.
METHOD III : CONFIRMATORY TEST FOR SULPHATE ION, SO42-
1) Measure and pour ……………… Observation:
of ………………………………..
solution into a test tube.
2) ………….. 2 cm3 of 1.0 mol dm-3 Inference:
………………………….. into the
test tube.
3) …………… 2 cm3 of 1.0 mol dm-3 Ionic equation:
…………………………………… into
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CHEMISTRY FORM 4 | CHAPTER 6: ACID, BASE AND SALT
2cm3
sodium
nitrate
solution
the test tube.
4) Record the observation.
METHOD IV : CONFIRMATORY TEST FOR NITRATE ION, NO3-
1) Measure and pour ……………… Observation:
of ……………………………….
solution into a test tube.
2) ………….. 2 cm3 of Inference :
……………………......
……………..into the test tube.
3) …………… 2 cm3 of 1.0 mol dm-3 Ionic equation:
……………………………… into the
test tube.
4) Slant the test tube. Add a few
drops of
………………………………… along
the wall of the test tube.
5) Record the observation.
Discussion
1) What was the gas released that causes the effervescence?
……………………………………………………………….
2) Name the white precipitate formed in the test for chloride ion, Cl -.
……………………………………………………………….
3) Name the white precipitate formed in the test for sulphate ion, SO 42-.
………………………………………………………………
4) What is the purpose of adding excess acid in the test for chloride ion, Cl - and sulphate ion,
SO42-?
…………………………………………………………………………………………………………………………
……………………..
…………………………………………………………………………………………………………………………
……………………..
Conclusion Hypothesis ……………………………
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