The correct option is NaHCO3.
Explanation
Baking soda is a common household chemical known scientifically as Sodium Hydrogen Carbonate or Sodium Bicarbonate. It is a mild non-corrosive basic salt widely used in cooking and medicinal applications.
Analysis of Options:
- NaHCO3 is correct: NaHCO3 is the chemical formula for Sodium Hydrogen Carbonate (Baking Soda). It is produced using sodium chloride as one of the raw materials in the Solvay process. Upon heating, it releases carbon dioxide, which makes dough rise.
- Na2CO3 is incorrect: Na2CO3 represents Sodium Carbonate. Its decahydrate form (Na2CO3·10H2O) is commonly known as Washing Soda. Anhydrous sodium carbonate is known as Soda Ash.
- NaCl is incorrect: NaCl is Sodium Chloride, commonly known as table salt or common salt.
- K2CO3 is incorrect: K2CO3 is Potassium Carbonate, historically known as pearl ash or potash.
Key Takeaway:
Baking Soda is Sodium Hydrogen Carbonate (NaHCO3), whereas Washing Soda is Sodium Carbonate Decahydrate (Na2CO3·10H2O).