Qualitative Tests

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  • Created by: jodi
  • Created on: 08-01-19 18:01
Explain how you would determine the formula of a hydrated compound by weighing and heating a hydrated salt to constant mass.
Weigh an evaporating basin; Add some hydrated solid and weigh the evaporating basin and solid; heat to constant mass (heat for a few minutes, cool then weigh and repeat until the mass does not change)
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Explain how you would use the deflection of a stream of liquid from a burette to indicate polarity or lack of polarity within a molecule.
Place the liquid in a burette and place a beaker underneath the jet; Open the tap and allow the liquid to run; Hold a charged polythene rod close to the stream and note any deflection; To compare the polarity of two liquids, use two burettes.
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Explain how you would carry out tests of electrical conductivity on solids, liquids and aqueous solutions of ionic and covelent substances.
Set up a circuit using a dc power pack and bulb; Add graphite electrodes and dip them into a beaker of aqueous solution; switch on the power and record if bulb lights; place solid between crocodile clips
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How would you determine the solubility of chlorine and iodine in aqueous and non-aqueous solvents.
Add 1cm of the solvents into seperate test tubes. Add equal volumes of a saturated hydrocarbon solvent e.g. hexane; Stopper the tube and invert; Allow the two layers to settle; Observe and record the colour.
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How would you produce a reactivity order of the halogens using the displacement reactions of the halogens with other halide ions in solution.
Add 1cm of each solution into seperate test tubes; Add 1cm of potassium chloride to each and record colour changes; Repeat experiment with potassium bromide and iodide solution; A saturated hydrocarbon could be used to distiguish between Br and I
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Other cards in this set

Card 2

Front

Explain how you would use the deflection of a stream of liquid from a burette to indicate polarity or lack of polarity within a molecule.

Back

Place the liquid in a burette and place a beaker underneath the jet; Open the tap and allow the liquid to run; Hold a charged polythene rod close to the stream and note any deflection; To compare the polarity of two liquids, use two burettes.

Card 3

Front

Explain how you would carry out tests of electrical conductivity on solids, liquids and aqueous solutions of ionic and covelent substances.

Back

Preview of the front of card 3

Card 4

Front

How would you determine the solubility of chlorine and iodine in aqueous and non-aqueous solvents.

Back

Preview of the front of card 4

Card 5

Front

How would you produce a reactivity order of the halogens using the displacement reactions of the halogens with other halide ions in solution.

Back

Preview of the front of card 5

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