Question

Укажите ионы, которые служат реактивами для обнаружения в растворе​

Answer 1

Ответ:

Качественная реакция на сульфат-, сульфит-, сульфид-ионы

Answer 2

Ions used as reagents for detection in solution

There are several ions that can be used as reagents for detection in a solution. Here are some examples:

1. Silver ion (Ag+): Silver ions can be used to detect the presence of halide ions, such as chloride (Cl-), bromide (Br-), and iodide (I-), in a solution. When silver ions react with halide ions, insoluble silver halides are formed, which can be observed as a precipitate. For example, the reaction between silver ions and chloride ions can be represented as follows: Ag+ + Cl- → AgCl.

2. Iron(III) ion (Fe3+): Iron(III) ions can be used to detect the presence of thiocyanate ions (SCN-) in a solution. When iron(III) ions react with thiocyanate ions, a blood-red complex called iron(III) thiocyanate is formed, which can be observed visually. The reaction can be represented as follows: Fe3+ + SCN- → [Fe(SCN)]2+.

3. Copper(II) ion (Cu2+): Copper(II) ions can be used to detect the presence of reducing sugars, such as glucose, in a solution. When copper(II) ions react with reducing sugars, a red precipitate of copper(I) oxide is formed. This reaction is known as the Benedict's test. The reaction can be represented as follows: Cu2+ + reducing sugar → Cu2O.

4. Lead(II) ion (Pb2+): Lead(II) ions can be used to detect the presence of sulfide ions (S2-) in a solution. When lead(II) ions react with sulfide ions, a black precipitate of lead(II) sulfide is formed. This reaction is often used to test for the presence of hydrogen sulfide gas. The reaction can be represented as follows: Pb2+ + S2- → PbS.

5. Barium ion (Ba2+): Barium ions can be used to detect the presence of sulfate ions (SO42-) in a solution. When barium ions react with sulfate ions, an insoluble white precipitate of barium sulfate is formed. This reaction is often used to test for the presence of sulfate ions in water. The reaction can be represented as follows: Ba2+ + SO42- → BaSO4.

These are just a few examples of ions that can be used as reagents for detection in a solution. There are many other ions and reagents that can be used for specific detection purposes, depending on the substances being tested for.