Obtain the experimental report of chemical purification of crude salt

There are four steps in total: dissolution, filtration, evaporation, and weighing.

Dissolution Experimental phenomenon: coarse salt solids are (gray) colored. The resulting liquid when added to water is (turbid). The remaining coarse salt is ()g

Conclusion: Coarse salt contains (sediment) and other impurities. Dissolve about 10 ml of coarse salt () g in water

Filtration Experimental Phenomenon: The filtrate is a (clear) liquid of (none) color, and the residue on the filter paper is (black).

Conclusion: The main component of the filtrate is sodium chloride solution.

The coarse salt (sediment) is insoluble in water and is left on the filter paper to be separated. Filtration can remove coarse brine (sediment).

Evaporation Experimental phenomenon: With heating, the evaporation dish.

the amount of medium fluid (decreased); When evaporation reaches a certain level, there is (solid) precipitation from the bottom of the evaporation dish. The solid obtained by evaporation is (white) colored.

Conclusion: If there is splashing of liquid or solid during the heating process, the cause is (uneven heating).The main component of the solid obtained is (sodium chloride).

Weighing Experimental phenomenon: The solid mass is () g

Conclusion: The yield of refined salt is ()%.

Experimental data is required for the unfilled part.

Purpose: To purify salt;

Principle: Dissolve the coarse salt in water, precipitate and filter out the insoluble impurities, and then remove the water by heating and other methods to obtain relatively pure salt.

1. The purpose of the experiment.

Master the operation skills of dissolution, filtration, evaporation and other experiments; Understand the chemistry of filtration for separating mixtures; Experience the principle of filtration and its application in social reality such as life and production; Refined salt is prepared.

2. Experimental instruments used.

Tray balance (including weights), graduated cylinder, beaker, glass stick, medicine spoon, funnel, filter paper, iron rack (with iron ring), evaporation dish, alcohol lamp, crucible pliers, rubber tip dropper, mortar, pestle, match, several small pieces of paper.

Coarse salt, distilled water, BaCl2 solution, NaOH solution, Na2CO3 solution, hydrochloric acid.

3. Experimental principle.

Coarse salt contains insoluble impurities such as sediment, in which insoluble impurities can be removed by dissolution and filtration, and then evaporate water to obtain purer refined salt.

4. Experimental procedures.

Weigh the remaining coarse salt on a balance and calculate approximately how many grams of coarse salt has been dissolved in 10 ml of water; Add excess BaCl2 (remove sulfate ions); Add excess NaOH (remove magnesium ions); Add excess Na2CO3 (remove calcium ions and barium ions in BaCl2); Filtration; Add an appropriate amount of HCl to the filtrate; Evaporation crystallization .

Summary. Purpose: The purpose of this experiment is to purify coarse salt through chemical experiments to make it meet the standard of food-grade salt.

Experimental principle: Coarse salt is extracted from seawater or salt mines, which contains impurities such as lime, sediment, calcium carbonate, etc. In order for coarse salt to meet the standard of food-grade salt, it needs to be purified.

There are many purification methods, and the dissolution crystallization method is used in this experiment. The dissolution crystallization method is to dissolve the coarse salt in water, increase its solubility by heating, and then cool the crystallization so that the impurities remain in the solution to obtain pure salt crystals. Protocol Procedure:

1.Take a certain amount of coarse salt and wash it with water to remove impurities on the surface. 2.

Put the coarse salt in a beaker, add the appropriate amount of water, and stir to combine. 3.Heat the solution in the beaker so that its solubility increases.

4.Once the solution is completely dissolved, it is cooled to room temperature to crystallize. 5.

The crystallized salt crystals are filtered out and washed with water. 6.Place the washed salt crystals in a desiccator and allow them to dry.

7.The dried salt crystals are weighed and their weight recorded. Experimental Results:

After purification, impurities in the coarse salt are removed, resulting in pure salt crystals. The results of the experiment are as follows: Sample weight:

Weight of salt crystals after 10g purification: 8g Purification rate: 80% Experimental conclusion:

Through the dissolution crystallization method, the coarse salt can be effectively purified to meet the standard of food-grade salt. In this experiment, the purification rate was 80%, indicating that the purification effect was good.

Coarse salt purification experiment report Detailed.

Good. The coarse salt purification experiment report is detailed as follows.

Purpose: The purpose of this experiment is to purify coarse salt through chemical experiments to make it meet the standard of food-grade salt. Experimental Principle:

Coarse salt is extracted from seawater or salt ore and contains impurities such as lime, sediment, calcium carbonate, etc. In order for coarse salt to meet the standard of food-grade salt, it needs to be purified. There are many purification methods, and the dissolution crystallization method is used in this experiment.

The dissolution crystallization method is to dissolve the coarse salt in water, increase its solubility by heating, and then cool the crystallization, and the orange dust leaves the impurities in the solution to obtain pure salt crystals. Experimental Procedure:1

Take a certain amount of coarse salt and wash it with water to remove impurities on the surface. 2.Put the coarse salt in a beaker, add the appropriate amount of water, and stir to combine.

3.Heat the solution in the beaker so that its solubility increases. 4.

Once the solution is completely dissolved, it is cooled to room temperature to crystallize. 5.The crystallized salt crystals are filtered out and washed with water.

6.Place the washed salt round crystals in a desiccator and let them dry out. 7.

The dried salt crystals are weighed and their weight recorded. Experimental results: After purification, the impurities in the coarse salt were removed, and pure salt crystals were obtained.

The results of the experiment are as follows: sample weight: 10g of salt crystal weight after purification:

8g purification rate: 80% Experimental conclusion: through the dissolution crystallization method, the crude salt can be effectively purified to meet the standard of food-grade salt.

In this experiment, the purification rate was 80%, indicating that the purification effect was good.