They are completely different chemicals. Caustic soda is sodium hydroxide (NaOH), a strong and highly corrosive alkali used in heavy industrial applications. Baking soda is sodium bicarbonate (NaHCO₃), a mild and safe alkaline compound used in cooking, cleaning, and personal care. Caustic soda has a pH of approximately 14, while baking soda has a pH of about 8.3. For more information (Click Here)