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Which one among the following chemicals is used as washing soda ?

June 1, 2025 by rawan239

Which one among the following chemicals is used as washing soda ?

Calcium carbonate

Calcium bicarbonate

Sodium carbonate

Sodium bicarbonate

This question was previously asked in

UPSC NDA-2 – 2017

Download PDF Attempt Online

The correct answer is Sodium carbonate.

Washing soda is the common name for sodium carbonate (Na₂CO₃). It is typically found as a hydrated salt, sodium carbonate decahydrate (Na₂CO₃·10H₂O).

Sodium bicarbonate (NaHCO₃) is commonly known as baking soda. Calcium carbonate (CaCO₃) is found in substances like limestone, marble, and chalk. Calcium bicarbonate is a temporary form of calcium carbonate that exists in aqueous solution and is not a stable solid chemical compound used as “washing soda”. Washing soda is used as a cleaning agent and water softener.

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