Question

Sodium carbonate is commonly known as:

• A. baking soda
• B. washing soda
• C. chalk
• D. plaster of paris

Answer 1

The correct option is B washing soda

Sodium carbonate or washing soda has a hydrous form and an anhydrous form. Hydrous form is when sodium carbonate has some water molecules attached to it (formula is $N{a}_{2}C{O}_3.10H_{2}O$). Anhydrous sodium carbonate does not have water molecules attached to it ($N{a}_{2}C{O}_3$ only).