This is called an equilibrium and is present in water and all aqueous solutions. In water and neutral solutions, the concentration of hydrogen ions is equal to the concentration of hydroxide ions.

The potassium carbonate dissolves in the water, along with some other salts. Reducing the aqueous solution down by evaporating much of the water, then filtering it, will leave a clear solution ...

The breakthrough, according to the scientists, is a major advancement in aqueous battery technology and offers a practical solution for ... to abundant materials and water-based electrolytes.