What do you mean by washing soda?
Mia Phillips
Updated on May 07, 2026
Washing soda is a chemical compound with the formula Na₂CO₃, also known as sodium carbonate, and it's a salt of carbonic acid. Some use washing soda to make homemade laundry detergent, to clean especially in hard water, and some even use it as a laundry additive to soften water.