What is hydration reaction? Md. Saifur Rahman The process of combining one or more water molecules with ionic compound while forming crystal lattice of ionic compound, it is called hydration reaction.You may likeDo I need car insurance?What is car insurance?How could I get cheaper car insurance?What is auto insurance?Why Adulterant food is the barrier to sound health?What are the producers?What are food preservatives?What is food chain?What is tertiary consumer?