The chemical name of washing soda is _____________
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → Sodium Carbonate decahydrate
Washing soda is sodium carbonate with ten molecules of water of crystallisation, \(\ce{Na2CO3.10H2O}\); ‘deca’ means ten. It is made from sodium carbonate by recrystallisation, and it is used for washing clothes and for removing the permanent hardness of water.
Tip: Do not mix it up with baking soda, sodium hydrogencarbonate \(\ce{NaHCO3}\), which has no water of crystallisation.