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This is a mixture of 2K+ and Cr2O72- ions in strong sulfuric acid, made from potassium chromate.

2CrO4- + 2H+ ----> Cr2O72- + H2O

chromate-yellow -> dichromate-orange

Note:

Potassium ions do NOT react, they are tribune-ions

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http://wiki.answers.com/What_is_the_word_equation_for_the_reaction_of_sulphur-di-oxide_with_acidified_potassium_dichromate