Experiments for 'Se'
Below follows a summary of all experiments, matching your search. Click one of the EXPERIMENT hyperlinks for a complete description of the experiment.
Results for 'Se':
EXPERIMENT 1
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Cadmium selenide reacts vigorously with nitric acid, producing nitrous
fumes and a yellow/orange solid, which is filled with many small gas bubbles
and hence remains floating on the liquid.
Cadmium sulfide gives a similar reaction, but now a pale yellow solid is
formed. This yellow solid is sulphur.
EXPERIMENT 2
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Selenium dissolves in a sulfide solution, forming a deep red/brown solution.
Hydrogen peroxide is capable of oxidizing this solution.
EXPERIMENT 3
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Cadmium ions give a precipitate with sulfide at very low concentration
of free sulfide ions. Only at very low pH, cadmium ions and hydrogen
sulfide can coexist in solution at appreciable concentration.
A very similar effect can be seen with combinations of cadmium and
selenide.
EXPERIMENT 4
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Sodium selenite dissolves in concentrated hydrobromic acid with a red/brown
color. When this solution is shaken with ligroin, then the ligroin layer also
turns red/brown. The compound, dissolved in the ligroin layer is a selenium
compound, as is demonstrated by the experiment, described in more detail below.
EXPERIMENT 5
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Selenium dissolves in very hot concentrated sulphuric acid, forming a dark
green liquid. On dilution, the red allotrope of selenium is precipitated.
EXPERIMENT 6
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Cesium ion allows many very special complexes to be isolated as solid salts. In
this experiment it is demonstrated how this is done for selenium and tellurium
complexes.
End of results for 'Se'