Elementary 3 Minor Chemistry Problems

According to the meaning, it should be something like "smooth mouth" of the water-solubility problem of acid-base salts. The breakdown is as follows:

1. "Potassium, sodium and ammonium salts are soluble", which means that cations are salt compounds composed of potassium, sodium and ammonium, which are almost soluble in water.

2. "Nitrate enters the water without a trace", which means that anions are salt compounds composed of nitrate ions, which can also be soluble in water.

3. "Chloride insoluble silver chloride", which means that most of the salt compounds composed of chloride ions are soluble in anions, and only silver chloride is insoluble in water.

4. "Sulfate does not soluble barium sulfate", the principle is the same as the third one, but the object is the sulfate ion. According to this sentence, only barium salt is insoluble in water, but not necessarily, because silver sulfate is also slightly soluble, and there will be white precipitate in water, but this salt is not common in junior high school.

4. "Carbonate is soluble potassium sodium ammonium, mostly precipitated and soluble in acid", which means that in carbonate, only a few such as potassium carbonate, sodium, and ammonium are soluble in water, and others are generally insoluble in water. However, carbonates are mostly soluble in strong acids. This, the more special is barium carbonate and sulfuric acid, because barium sulfate and barium carbonate are insoluble in water, in the end barium carbonate into dilute sulfuric acid reaction is not reacting?

Theoretically, it should be possible, but in practice, because the resulting barium sulfate particles quickly cover the surface of the barium carbonate, making it difficult for the reaction to continue, it is still considered to be non-reactionary. This knowledge point is not examined in high school chemistry, just know it.

5. "Finally, remember alkalis." Soluble potassium sodium barium", which means that among the various bases, only potassium hydroxide, sodium, and barium are soluble in water, and the other bases are insoluble or only slightly soluble in water. Of course, there are omissions in this, such as ammonia (which is also a base [in the form of (NH4)OH], which of course is soluble in water.

However, the knowledge of the ammonium ions mentioned above can be used to explain here.

In the end, these songs are just general rules, and there are some special things that will "surface" with the "deepening" of your knowledge, hehe, I wish you progress in your learning!

It is said that the water-soluble potassium, sodium and ammonium salts of salts are soluble: potassium salts, sodium salts, and ammonium salts are all soluble in water.

Chloride insoluble silver chloride: AGCl is a white precipitate Baso4 is a precipitate.

Give you a mouth: dissolve: potassium, sodium, ammonium, nitrate. There are 5 types of soda soda: potassium, calcium, sodium, barium, and ammonium. Sulfuric acid removes barium, chlorine removes silver.