What are acid and bases?


The substances that taste sour are called acid and their nature is acidic.

The term acid is derived from a Latin word acere which means sour.

An acid is a molecule or ion capable of donating a proton, or, alternatively, capable of forming a covalent bond with an electron pair.

 Acid turns blue litmus paper to red. Acid is a substance that contains hydrogen ion (H+).

• Acids do not give colour with phenolphthalein indicator and do not absorb carbon dioxide gas. Also, acids do not react with an ammonium salt.

• Natural Acids are the acids that occur in nature, such as, acids present in fruits.

• Acids are generally found in Vinegar, Curd, Spinach, lemons, Citrus fruits, Amla, Tamarind, grapes, unripe mangoes, Citrus fruits such as oranges, etc.

Acids react with Bases to give Salt and Water. Acid + Base --> Salt + Water


Any class of compounds that form hydroxyl ions (OH) when dissolved in water is called Base. 

 Its aqueous solutions react with acids to form salts. 

 Acid + Base --> Salt + Water

 Bases turn red litmus paper blue and have a pH greater than 7.

 Some of the common bases are NH4OH, NaOH, KOH.

Bases are Bitter in taste.

 Bases are Odorless (except ammonia).

Bases are slippery.

 Bases Reacts with fats and oils.

Bases give pink colour with phenolphthalein


Simply Easy Learning

Updated on: 10-Oct-2022


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