Multiple choice

The formula for washing soda is

  1. Na2CO3

  2. Na2CO3. H2O

  3. Na2CO3. 7H2O

  4. Na2CO3.10 H2O
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Na2CO3.10H2O is the correct formula for washing soda (sodium carbonate decahydrate). This is different from soda ash (anhydrous Na2CO3) or the monohydrate form. The 10 water molecules are chemically bound in the crystal structure, which gives washing soda its characteristic properties.

Keep practicing — related questions