Alkaline means "having a pH between 7.1 and 14". Caustic means harsh, corrosive in some way. Both strong acids and strong bases are caustic.
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Alkaline refers to a substance with a pH greater than 7, while caustic refers to a substance that can burn or corrode living tissue. While both terms refer to substances that are basic in nature, caustic typically implies a stronger and more harmful effect on contact.
Caustic potash is potassium hydroxide (KOH), while caustic soda is sodium hydroxide (NaOH). Both are strong alkaline compounds used in industrial processes such as chemical manufacturing and water treatment, but they differ in their chemical composition and properties.
There is no difference between an alkaline battery and a pile alkaline battery. "Pile" is just a term used in French to refer to a battery. Both terms describe the same type of battery that uses an alkaline electrolyte.
One will make your clothes smell fresh, the other will dissolve them. Borax is sodium borate Caustic Soda is also called lye or sodium hydroxide. It is a very corrosive alkaline material.
Caustic soda and lye are sometimes used interchangeably to refer to sodium hydroxide. However, caustic soda typically refers to a strong solution of sodium hydroxide in water, while lye can refer more broadly to any strong alkaline solution used in various applications, including sodium hydroxide, potassium hydroxide, or even calcium hydroxide.
A normal or neutral pH level is 7. Caustic soda is highly basic with a pH of between 13.5 and 15. Caustic soda is a dangerous base and should be handled carefully.