Description of experiment
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Needed compounds:
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sodium chloride : NaCl
sulphuric acid : H2SO4
trichloroisocyanuric acid : C3N3O3Cl3
Class:
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elem=Cl
redox
Summary:
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TCCA does not react with sulphuric acid, at least not visibly. Even when
heated, no reaction seems to occur. On addition of some solid NaCl vigorous
evolution of chlorine gas is observed.
Description:
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Take 1 ml of 2M sulphuric acid and add a piece of TCCA, the size of a pea:
The TCCA does not dissolve, no visible reaction can be observed.
Boil the liquid for a while: Still no visible reaction can be observed, nor
does the TCCA dissolve (at least not to an appreciable extent).
Add a small amount of solid NaCl to the still hot liquid: A violent reaction
occurs in which chlorine gas is produced. Quickly, the test tube is filled
with the pale green gas. After a while, the reaction stops, apparently when
all of the chloride is used up. A smaller piece of TCCA remains in the liquid
in the form of a small chunk, it does not further react nor dissolve.
Add much more NaCl: Again a violent reaction occurs in which chlorine is formed,
now all of the TCCA reacts, a white precipitate is formed. This precipitate
is cyanuric acid.