How is Carbonic acid, dipotassium salt, hydrate (2:3) (CAS: 6381-79-9) typically synthesized?

Carbonic acid, dipotassium salt, hydrate (2:3) is synthesized by the reaction of potassium carbonate with carbon dioxide in an aqueous solution. The process involves the formation of potassium hydrogen carbonate, which then reacts with additional potassium carbonate to form the dipotassium salt. The reaction is typically conducted at room temperature and involves careful control of pH and temperature to achieve high yield and selectivity.