Basic chemistry (common names): What is the chemical compound popularly known as washing soda? Identify the correct inorganic salt corresponding to the household name. Choose the correct compound.

What is being asked?
The chemical identity behind the household name "washing soda".

Given data

• Common name: Washing soda

Concept/Approach
Washing soda is the decahydrate of sodium carbonate: Na₂CO₃·10H₂O. (Do not confuse with baking soda = NaHCO₃.)

Step-by-step reasoning
Sodium carbonate decahydrate is used as a water softener/alkali in cleaning → hence the name "washing soda".

Common pitfalls
Mixing up washing soda (Na₂CO₃·10H₂O) with baking soda (NaHCO₃).

Final Answer
Sodium carbonate (Na₂CO₃·10H₂O)