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Potassium
Dichromate
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Potassium dichromate, K2Cr2O7, is a common inorganic chemical reagent,
most commonly used as an oxidizing agent in various laboratory and
industrial applications.
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It is
a crystalline ionic solid with a very bright, red-orange color. It is
also known as potassium bichromate; bichromate of potash; dipotassium
dichromate; dichromic acid, dipotassium salt; chromic acid, dipotassium
salt; and lopezite.
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It is
not combustible, but it is a strong oxidizer that enhances the
combustion of other substances.
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Reacts
violently with hydrazine, anhydrous hydroxylamine, and mixtures of
sulfuric acid and acetone but it not compatible with oxidizing agents
and strong acids like hydrochloric, nitric.
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Potassium dichromate may be used to prepare "chromic acid", which can be
used for cleaning glassware and etching materials.
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Potassium dichromate has important uses in photography and in
photographic screen printing, where it is used as an oxidizing agent
together with a strong mineral acid.
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A
potassium dichromate solution in sulfuric acid can be used to produce a
reversal negative (i.e., a positive transparency from a negative film).
This is effected by developing a black and white film but allowing the
development to proceed more or less to the end point.
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Potassium dichromate paper can be used to test for sulfur dioxide, as it
turns distinctively from orange to green. This is typical of all redox
reactions where hexavalent chromium is reduced to the less harmful
trivalent chromium.
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K2Cr2O7 was a most effective strong inhibitor for corrosion protection
of mild steel reinforcement in concrete.
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Used
in initiated polymerization of aniline in acidified aqueous medium was
carried out as a function of parameters such as pH, aniline mole ration,
temperature and time.
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The
dissolution of chalcopyrite in acidic potassium dichromate solution is
that the dissolution rate increased with increasing K2Cr2O7
concentration.
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