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Составьте координационные формулы следующих комплексных соединений кобальта: 3NaNO2•Co(NO2)3, CoCl3•3NН3•2Н2О, 2KNO2•NH3•Co(NO2)3. Координационное число кобальта (III) равно шести. Напишите уравнения диссоциации этих соединений в водных растворах.
