Multiple choice

Washing soda is the common name for ______.

  1. Calcium carbonate

  2. Calcium bicarbonate

  3. Sodium carbonate

  4. Sodium bicarbonate
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Washing soda is sodium carbonate decahydrate (Na2CO3·10H2O), used in laundry and cleaning. Calcium carbonate is limestone/chalk, calcium bicarbonate is found in hard water, and sodium bicarbonate is baking soda - these are distinct compounds with different uses.

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