How to distinguish between salt and soda ash How to distinguish between salt and soda ash

Method: 1. The salty taste is salt. 2. Hydrochloric acid is added dropwise to the sampling, and sodium carbonate is produced by gas.

3. Sample and prepare a solution, and add acidified silver nitrate solution dropwise, and the white precipitate produces table salt. Fourth, it can be distinguished by observing the appearance: soda ash is white powder, or white opaque fine particles, while table salt is fine colorless transparent crystal particles.

Take any of them, add excessive vinegar, the gas is soda ash, and the salt that does not change.

Soda ash is one of the most important chemical raw materials, widely used in chemical, glass, metallurgy, papermaking, printing and dyeing, synthetic detergent, petrochemical, food, medicine and health and other industries, with a large amount and an important position in the national economy. Soda ash is used in fire-fighting equipment to produce acid-alkali fire extinguishers and foam fire extinguishers. The rubber industry uses it in combination with alum and H poring agent to play the role of uniform pores for the production of rubber and sponge.

It is used in the metallurgical industry as a flux for casting steel ingots. In the machinery industry, it is used as a forming aid for cast steel (sand turning) sand molds. In the printing and dyeing industry, it is used as a fixing agent for dyeing and printing, an acid-base buffer, and a post-treatment agent for fabric dyeing and finishing.

The addition of baking soda to the dyeing prevents the spout from producing color flowers. It is used as a raw material for acid making agents in the pharmaceutical industry. References: Shouguang City Jiangtao Material Management Office.

Remember.

Add some vinegar, bubbling is soda ash (bubbling is carbon dioxide).

Add hydrochloric acid to see if there are bubbles (carbon dioxide) produced, and if soda ash (sodium carbonate) is produced

Add vinegar, and bubbles produce soda ash.

First, the composition is different.

1. Alkali: refers to the compound of OH-.

2. Salt: refers to a class of compounds in which metal ions or ammonium ions (NH+) are combined with acid ions, such as calcium sulfate, copper chloride, and sodium acetate.

Second, ** is different.

1. Alkali: In the theory of acid-base ionization, alkali refers to the compound that ionizes anions ionized in aqueous solution, all of which are OH-.

2. Salt: Generally speaking, salt is the product of metathesis reaction, such as sulfuric acid and sodium hydroxide to produce sodium sulfate and water, and there are other reactions that can generate salt, such as displacement reaction.

Third, the nature is different.

1. Alkali: the alkali solution turns blue when it encounters purple litmus test solution (the phenomenon is not obvious, but there is a change), and it turns red when it encounters a colorless phenolphthalein solution (the phenomenon is obvious).

2. Salt: In most cases, the transparency or opacity of the salt surface is only related to the single crystal that makes up the salt. When light hits the salt, it is reflected back by grain boundaries (the boundary between crystals), and large crystals appear transparent, while polycrystals clumped together look more like white powder.

Basic saltsThe definition of is generated upon ionizationAnionIn addition to acid ions, there are hydroxide ions,CationsSalt of metal ion (or NH).

Classification of salt.

Categories: Life >> common sense of life.

Problem description: The easiest way.

Analysis: There are several ways to do this:

1.Soda ash is sodium carbonate, and the main component of Shiyun round salt is sodium chloride, so some vinegar is added to the two powders, and the bubbling is soda ash (bubbles are carbon dioxide gas produced).

2.The above is the method of chemical coding, the physical method can be touched and felt by hand, and the eyes can be observed to distinguish the difference, the salt is relatively rough and grainy, and the soda ash is not grainy, it is very slippery, like flour.

The main thing is the easiest way, so choose the second one, fine

Dissolve in water separately.

1. Add dilute source volic hydrochloric acid respectively, and the bubbles produce soda ash, otherwise it is table salt.

2. Drop into the colorless phenolphthalein test solution respectively, the one that turns red is soda ash, otherwise it is table salt.

3. Inject clarified lime water respectively, which can make the lime water turbid is soda ash, otherwise it is table salt.

4. Drop silver nitrate solution respectively, white turbidity is table salt, and brown and black turbidity is soda ash (because soda ash is alkaline, it is silver oxide, and it is not silver carbonate).

5. If you are in your own home, twist a little bit by hand, and the slippery feeling is soda ash, otherwise it is table salt. (Note that this method should not be used in the laboratory, as any drug sold in the laboratory should not be touched by hand.) ）

The salt is granular and salty in taste;

The alkali is powdery and has an astringent taste.

Chemical distinction. You can put salt and alkali into two test tubes respectively, and then add CaCl2 (calcium chloride) solution dropwise to the two test tubes, if there is a precipitate to form alkali, if there is none, it is table salt.

Base refers to a substance that ionizes anions in an aqueous solution and is all OH-;

The main component of salt is sodium chloride, as well as barium salt, chloride, magnesium, lead, arsenic, zinc, sulfate and other impurities.