For example, barium sulfate has little solubility, but the dissolved part is completely ionized. Barium sulfate is a strong electrolyte, and there is no ionization equilibrium. Write the ionization equation with =.

However, the solubility of barium sulfate is small, and the dissolution equilibrium in aqueous solution is expressed as follows.

BaSO4(s) invertible number Ba 2+(aq)+SO4 2-(aq) (superscript is not needed, hehe)

Another example is Al(OH)3, which is a weak electrolyte and insoluble. Both ionization equilibrium and dissolution equilibrium are expressed by reversible symbols, but dissolution equilibrium is generally written as state.