Grade 9 Integrated Science
Practical #
International School Manila
Name:
Date:
QUALITATIVE ANALYSIS: TESTING FOR ANIONS AND GASES
In this practical you will again practice following instructions and using your manipulative skills. You will also be
assessed on how well you make and accurately record observations (Data Collection and Processing).
Before coming to class you must decide on the clearest way to present your results. Make your data collection table
and bring it with you to the lesson. You will not have time to record your results in rough.
Introduction You will carry out some tests which can be used to identify anions (negative ions) and gases.
Procedure
Testing for anions
Reagent
Acidified Silver
nitrate
Anion
(test solution)
Chloride (Cl)
(potassium chloride)
Bromide (Br)
(potassium bromide)
Test
Add a few drops of silver nitrate solution to approximately
1cm3 of each test solution. Leave your tubes in sunlight for
at least 10 minutes
Iodide (I)
(potassium iodide)
Lead nitrate
Iodide (I)
(potassium iodide)
Add a few drops of lead nitrate solution (Toxic) to
approximately 1cm3 of the test solution.
Acidified
Barium chloride
Sulfate (SO42)
(sodium sulfate)
Add a few drops of barium chloride solution (Toxic) to
approximately 1cm3 of the test solution.
Hydrochloric
acid
Carbonate (CO32)
(sodium carbonate)
Add a few drops of dilute hydrochloric acid to approximately
1cm3 of the test solution.
Testing for gases
1. Put a piece of shiny magnesium ribbon (approximately 2 cm in length) into a test tube. Add 2cm 3 of dilute
hydrochloric acid. Place your thumb over the top of the tube (to stop any gas escaping). When you feel the gas
inside exerting pressure on your thumb, remove thumb and immediately insert a lighted wooden splint into the
tube.
2. Place manganese(IV) oxide powder (the volume of a pea) into a test tube. Add 2 cm3 of dilute hydrogen
peroxide solution. Place your thumb over the top of the tube (to stop any gas escaping). When you feel the
gas inside exerting pressure on your thumb, remove thumb and immediately insert a glowing wooden splint into
the tube.
3. Place 1 cm3 of limewater into a boiling tube and put to one side. In a separate test tube add 1 cm 3 of dilute
hydrochloric acid to a spatula full of calcium carbonate powder. Place your thumb over the top of the tube (to
stop any gas escaping). When you feel the gas inside exerting pressure on your thumb, remove thumb and
carefully pour the gas produced into the boiling tube. Stopper the boiling tube and shake.
Grade 9 Integrated Science
Practical #
International School Manila
Name:
Date:
Questions (You will work through your results with your teacher in order that you can answer the following)
1.
2.
3.
4.
5.
6.
What are the names of the precipitates formed in the halide ion and the sulfate ion tests?
Write balanced chemical equations for all of the reactions occurring in the anion tests.
Identify the three gases produced and tested for in the gas tests.
Write a balanced chemical equation for the reaction which produced hydrogen gas.
What is the similarity between the carbonate ion test and the gas test 4?
Write a balanced chemical equation for the reaction which produced oxygen gas.