The reaction of iron sulfide and dilute sulfuric acid in the preparation method of hydrogen sulfide
First, the principle of reaction.
The interaction of iron sulfide with dilute sulfuric acid is an important method for the preparation of hydrogen sulfide. The chemical equation for this reaction is: Fes + H2SO4 (dilute) H2S + FeSO4.
2. Experimental materials.
The materials required for the experiment include iron sulfide, dilute sulfuric acid, test tubes, beakers, plastic films, rubber bands, and experimental manuals.
3. Experimental procedures.
1.Put the iron sulfide into the test tube, add an appropriate amount of dilute sulfuric acid, and make the reaction proceed at room temperature.
2.The mouth of the test tube is sealed with plastic film and rubber bands to prevent hydrogen sulfide gas leakage.
3.Observe and record the gases produced during the reaction, and record their color, odor and other characteristics.
4.When the reaction is over, the reaction solution in the test tube is introduced into a beaker and diluted with an appropriate amount of water.
5.Measure the pH of the solution with a test strip and record the results.
6.Let the solution sit for a period of time to observe and record the formation of the precipitate.
7.According to the experimental results, the experimental process and conclusions were analyzed and summarized.
Fourth, experimental results and analysis.
1.During the reaction, it can be observed that a colorless, rotten egg odor is produced, which is typical of hydrogen sulfide gas.
2.At the end of the reaction, the reaction solution is introduced into a beaker and the solution takes on a pale green color due to the formation of FeSo4.
3.Measuring the pH of the solution by dipstick shows that the solution is acidic, which is caused by an excess of dilute sulfuric acid.
4.After standing the solution for a period of time, the formation of a precipitate can be observed, which is due to the reaction of FeSo4 with H2S to form a FeS precipitate.
5.Through the analysis of experimental results, the following conclusions can be drawn: hydrogen sulfide gas can be prepared by the interaction of iron sulfide and dilute sulfuric acid, and the generated FeSO4 and H2S can react to form FeS precipitate.
5. Application. In this experiment, hydrogen sulfide gas was prepared by the reaction of iron sulfide and dilute sulfuric acid, and its properties and reaction products were observed. The experimental results show that this method is an effective way to prepare hydrogen sulfide. In practical application, this method can be used to prepare hydrogen sulfide gas and provide reference and guidance for related fields. For example, in chemical production, hydrogen sulfide gas can be prepared by this method as a chemical raw material or intermediate;In the field of environmental protection, this method can be used to remove harmful gases such as hydrogen sulfide in exhaust gases.
6. Safety precautions
1.A lab coat and goggles must be worn during the experiment to prevent accidental injury.
2.Dilute sulfuric acid is corrosive, and direct contact with ** or inhalation of its vapor should be avoided during the experiment.
3.When using iron sulfide, avoid contact with water to avoid the production of highly toxic hydrogen sulfide gas.
4.When the experiment is over, the reaction solution in the test tube should be properly disposed of to avoid pollution to the environment.
5.During the experiment, it is necessary to observe and record the gas generation in the reaction process, and deal with unexpected situations in a timely manner.
7. Summary of experiments.
In this experiment, hydrogen sulfide gas was prepared by the reaction of iron sulfide and dilute sulfuric acid, and its properties and reaction products were observed and analyzed. The experimental results show that this method is an effective way to prepare hydrogen sulfide, and the generated FeSo4 and H2S can react to form FeS precipitate. In practical application, this method can be used to prepare hydrogen sulfide gas and provide reference and guidance for related fields. Through this experiment, we not only learned about the preparation method of hydrogen sulfide, but also mastered the relevant experimental skills and safety precautions.