54. Solving a chemistry problem

54. Solving a chemistry problem

21. In the form of what compounds do cations of the third group precipitate: zinc (II), manganese (II), chromium (III), aluminum (III) - when they are exposed to a group reagent in the presence of an ammonium buffer? Make up the reaction equations and explain why some cations precipitate in the form of sulfides, others - in the form of hydroxides?

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