There is something in the acid, alkali and salt section of junior high school chemistry. The first two sentences are: potassium, sodium, ammonium and nitrate can be dissolved in water. The rest is complete. You should be talking about the salt solubility formula in junior high school. I have collected some formulas for you here. We also used it in junior high school. We just want to choose a formula that we are more proficient in. In fact, if you do more questions, you will remember.

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Solubility formula 1

Potassium sodium ammonium salt dissolves quickly in water, ①

Remove barium, lead and calcium with sulfate. ②

Chloride insoluble silver chloride,

Nitrate solution is transparent. ③

Everything in the formula will sink.

note:

① Potassium, sodium and ammonium salts are all soluble in water;

② Only barium sulfate, lead sulfate and calcium sulfate are insoluble in sulfate;

③ Nitrates are all soluble in water;

④ All salts not involved in the formula are insoluble in water;

Solubility formula 2

Potassium, sodium, ammonium salts and nitrates;

Removing silver and mercury by chloride;

Removing barium and lead with sulfate;

Carbonic acid, phosphate, only soluble in potassium, sodium and ammonium.

The results show that the above four ballads summarize eight water-soluble and water-insoluble additives.

Solubility formula 3

Potassium, sodium, ammonium and nitrate are all soluble, but hydrochloric acid is insoluble in silver and mercurous chloride.

Barium, lead and carbon phosphate insoluble in sulfate are mostly insoluble.

Most acids are soluble in alkali, but only potassium, sodium, ammonium and barium are soluble.

Solubility formula 4

Potassium, sodium and nitric acid are soluble, (potassium salt, sodium salt and nitrate are all soluble in water. )

Except silver (mercury), hydrochloric acid is soluble (except silver chloride and mercurous chloride).

Barium and lead are not allowed except sulfate (barium sulfate and lead sulfate are insoluble in sulfate).

Other salts (carbonate, sulfite, phosphate, silicate and sulfide)

Only potassium, sodium and ammonium are soluble (only the corresponding potassium, sodium and ammonium salts are soluble).

Finally, alkali, potassium, sodium, ammonium and barium (potassium hydroxide, sodium hydroxide, barium hydroxide and ammonia water are all soluble).

There are several other slightly soluble substances that can be memorized separately.

Solubility formula 5

Potassium sodium ammonium nitrate

It is not difficult to completely dissolve.

Mercury chloride and silver chloride

Barium sulfate and lead sulfate

Produce a precipitate in the heart

Bisulfate and alkali

Nitrate carbonate phosphate

Only soluble in potassium, sodium and ammonium.