Washingsodais the common name for the chemical compound sodium carbonate decahydrate. It is a white, crystalline solid that is highly soluble in water. Its chemicalformulais Na₂CO₃·10H₂O, which indicates that eachformulaunit of sodium carbonate is associated with ten molecules of water, known as the water of crystallisation. Washing soda is a white powder with the formulaNa2CO3.10H2O.It is obtained by recrystallization of sodium carbonate, which is produced by Solvay's process. Learn more about washing soda, plaster of Paris and baking soda. Sodium carbonate, also known as washing soda, is a white solid with the chemical formulaNa2CO3.It has various forms, such as anhydrous, monohydrate, heptahydrate and decahydrate, and different physical and chemical properties depending on the form. Aug 1, 2025 ·Washingsoda, also known as sodium carbonate, is the chemical compound with theformulaNa2CO3. Washingsodahas a much higher pH level than bakingsoda, and is not safe to consume.