Carbonate can be divided into three types: positive salt, acid-type salt, and alkali carbonate. Most of the carbonate and acid-type carbonate are colorless. The carbonate of alkali metals and ammonium is easy to dissolve in water, and the carbonate of other metals is difficult to dissolve in water.
The solubility of sodium bicarbonate in water is small, and other acid-type carbonates are easily dissolved in water. Metal ions containing hydrogen-oxygen groups are called alkaline salts and are reinforced salt.
Regarding the solubility of carbonate in water, in general, carbonate is difficult to dissolve metal with a relatively large dissolving degree in carbonate; while carbonate is easy to dissolve metal, the solubility of bicarbonate is significantly reduced. It is generally considered to be HCO3-ions formed a hydrogen bonding in the solution for each other to reduce the solubility. The soluble carbonate will be hydrolyzed in the aquatic solution to make the solution alkaline.
Carbonate Hydrolysis
The first step of hydrolysis is the main. For the acidic carbonate of alkali metal, the second step is the main, but the degree of hydrolysis is much less than the first step. The carbonate that is difficult to solve in water can be soluble in the saturated solution of sparse strong acid, acetic acid, or carbon dioxide.
Carbonate is decomposed into metal oxides and released carbon dioxide when heating. This reaction is a non-oxidation reaction. The thermal stability of different carbonates is very different. Among them, the thermal stability of alkaline metal and alkaline soil metal carbonate is high, and it must be burned to a high temperature before decomposition; some metals carbonate has low thermal stability, which will be decomposed by heating to about 100 ° C, such as carbonate, such as carbonate, etc.; Some carbonate can be decomposed at normal temperatures, such as mercury. The heat stability of acid-type carbonate is much lower than the carbonate of the same metal.
The solubility of sodium bicarbonate in water is small, and other acid-type carbonates are easily dissolved in water. Metal ions containing hydrogen-oxygen groups are called alkaline salts and are reinforced salt.
Regarding the solubility of carbonate in water, in general, carbonate is difficult to dissolve metal with a relatively large dissolving degree in carbonate; while carbonate is easy to dissolve metal, the solubility of bicarbonate is significantly reduced. It is generally considered to be HCO3-ions formed a hydrogen bonding in the solution for each other to reduce the solubility. The soluble carbonate will be hydrolyzed in the aquatic solution to make the solution alkaline.
Carbonate Hydrolysis
The first step of hydrolysis is the main. For the acidic carbonate of alkali metal, the second step is the main, but the degree of hydrolysis is much less than the first step. The carbonate that is difficult to solve in water can be soluble in the saturated solution of sparse strong acid, acetic acid, or carbon dioxide.
Carbonate is decomposed into metal oxides and released carbon dioxide when heating. This reaction is a non-oxidation reaction. The thermal stability of different carbonates is very different. Among them, the thermal stability of alkaline metal and alkaline soil metal carbonate is high, and it must be burned to a high temperature before decomposition; some metals carbonate has low thermal stability, which will be decomposed by heating to about 100 ° C, such as carbonate, such as carbonate, etc.; Some carbonate can be decomposed at normal temperatures, such as mercury. The heat stability of acid-type carbonate is much lower than the carbonate of the same metal.