Question

с помощью одного реактива распознайте растворы хлориды железа (III) , хлорида калия , хлорида алюминия

Answer 1

Я же уже писала!
Реактив для распознавания - раствор щелочи (NaOH или KOH)
1. Добавляем небольшое количество щелочи - пробирка, в которой не выпадет осадок, содержит хлорид калия.
2. Добавляем большой избыток щелочи. Пробирка, в которой белый осадок растворился, содержит хлорид алюминия AlCl3.
3, В третьей пробирке, где выпавший бурый осадок не растворился, - хлорид железа FeCl2.

Answer 2

Recognizing Solutions of Iron(III) Chloride, Potassium Chloride, and Aluminum Chloride

To recognize the solutions of iron(III) chloride, potassium chloride, and aluminum chloride using a single reagent, you can perform a simple chemical test. One common reagent used for this purpose is potassium ferrocyanide, which forms colored precipitates with specific metal ions.

When a solution of iron(III) chloride is mixed with potassium ferrocyanide, a deep blue precipitate forms, indicating the presence of iron(III) ions. This reaction can be represented as:

FeCl3 + K4[Fe(CN)6] → Fe4[Fe(CN)6]3(s) + 4KCl

On the other hand, when a solution of potassium chloride or aluminum chloride is mixed with potassium ferrocyanide, no visible precipitate forms, indicating the absence of iron(III) ions.

Therefore, by using a single reagent, you can differentiate between the solutions of iron(III) chloride and the solutions of potassium chloride and aluminum chloride based on the formation of a colored precipitate.

This information is based on chemical reactions involving the mentioned compounds and the reagent potassium ferrocyanide.

If you have further questions or need additional information, feel free to ask!