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Cromato de potássio reagindo com nitrato de chumbo (II)

tubo de ensaio com precipitado amarelo
A intensa cor amarela presente neste líquido é resultante da formação e precipitação de cromato de chumbo (PbCrO4), como resultado da adição de gotas de nitrato de chumbo ao líquido contendo cromato de potássio.

O cromato de chumbo é venenoso, em contato com a pele causa queimaduras, e pode ser fatal se ingerido. Por ter uma cor amarela intensa a substância foi algumas vezes, no passado, utilizada em corantes alimentares adulterados, resultando em intoxicação dos que ingeriram o produto.

Imagem sob licença Creative Commons

Texto escrito por Prof. Dr. Luís Roberto Brudna Holzle ( luisbrudna@gmail.com ).

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  1. Nubi Manuel Augusto 06/05/2013

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