Question : The chemical formula of washing soda is
Option 1: Na2So4 .10H2O
Option 2: NaHCO3
Option 3: Na2CO3.10H2O
Option 4: Ca(OH)2
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Correct Answer: Na 2 CO 3 .10H 2 O
Solution : The correct answer is Na 2 CO 3 .10H 2 O.
Sodium carbonate decahydrate (Na 2 CO 3 ·10H 2 O), also known as washing soda, is the most common hydrate of sodium carbonate, having 10 molecules of water of crystallization. Soda ash is dissolved in water and crystallized to get washing soda.
Na 2 CO 3 +10H 2 O⟶Na 2 CO 3 ⋅10H 2 O
It is one of the few metal carbonates that is soluble in water.
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