In the salt formed by the complete neutralization of acid and alkali, there will be no hydrogen ions in the acid or hydroxide ions in the alkali, only metal cations and acid radicals. Such a salt For positive salt. The reaction that generates a positive salt, such as: HCl+NaOH=NaCl+H2O, a normal salt can ionize to produce NaCl—Na++Cl-When an acid reacts with a base, if the hydrogen ions in the acid are partially neutralized, the metal will be removed from the generated salt. In addition to cations and acid ions, there are also hydrogen ions. Such salts are acid salts. For example, NaHSO4, KHCO3, KH2PO4, K2HPO4, Ca(HCO3)2, etc. are all acid salts. Monobasic acids cannot form acid salts, only dibasic or polybasic acids can form acid salts. There are many types of acid salts with different properties. Some aqueous solutions of acid salts are acidic, such as NaHSO4, KHSO4, KH2PO4, etc.; some are alkaline, such as NaHSO3, KHCO3, K2HPO4, etc. Acidic salts can ionize KHCO3—K++HCO-3H+ HCO-3— H+ CO2-3. When an acid reacts with a base, if the hydroxide ions in the base are partially neutralized, the salt generated is a basic salt. Monobasic bases cannot form basic salts, only dibasic or polybasic bases can form basic salts. The composition and properties of basic salts are complex and diverse. Basic copper carbonate Cu2(OH)2CO3 and basic magnesium chloride Mg(OH)Cl are all basic salts. Basic salts can be ionized (can be regarded as salts synthesized from metal ions, hydroxides and anions) Cu2(OH)2CO3—2Cu2+ +2OH- +CO2-3