Baking soda is sodium bicarbonate, with the chemical formula NaHCO₃. Sodium carbonate is washing soda (Na₂CO₃). Sodium hydroxide is caustic soda (NaOH), and calcium carbonate is limestone or marble (CaCO₃). Baking soda is widely used in baking as a leavening agent.
Explanation:
Sodium is a soft alkali metal that can be easily cut with a knife, revealing a silvery surface that tarnishes quickly in air. Potassium is also soft. Iron, zinc, and copper are much harder. Alkali metals have low density and low melting points. They are stored under kerosene to prevent reaction with moisture and oxygen.
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