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Reactivo de Dragendorff(7)<br />

Disolver 1.0 g de sub nitrato de bismuto en 3.0 mL de acido clorhídrico 10 M en<br />

caliente.<br />

Diluir a 20.0 mL con agua y disolver 1.0 g de yoduro de potasio en la mezcla. Si<br />

se oscurece el triyoduro de bismuto separar, añadir acido hidroclorhidrico 2 M y<br />

mas yoduro de potasio para resolver este.

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