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What is the chemical formula for washing soda?

1. Na₂CO₃
2. NaHCO₃
3. NaCl
4. NaOH

Correct answer: Na₂CO₃

Solution

Washing soda is sodium carbonate, whose chemical formula is Na₂CO₃. Sodium bicarbonate is baking soda, which has the formula NaHCO₃.

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