7th Class Science Acids, Bases and Salts Concentrated and Diluted Acid

Concentrated and Diluted Acid

Category : 7th Class

*       Concentrated and Diluted Acid


The substance, which has hundred percent of acid is called concentrated acid.  It completely dissolves in water and furnish ions.

The concentrated acid is also called strong acid. The acid, which has lower percent of acid is called diluted or weak acid. Dilute acid is not a pure form of acid, during the chemical reaction its performance is slower than the concentrated acid. It does not dissolve completely in water or furnish ions. In the following chemical reaction, carbon dioxide reacts with water and gives hydro carbonic acid. This is the weak and diluted acid.


Acids can be categorized into three main types, natural acids, mineral acid and organic acid. Natural acid is obtained from plants. The sources of citric acids are lemon and orange. Apple contains malic acid. Tomatoes are the big sources of oxalic acid. Milk is the source of lactic acid. Tea is the source of tannic acid. Vinegar is the source of acetic acid. Vitamins are the sources of amino acid. The acids prepared from the minerals are called mineral acid.

These are sulphuric acid , nitric acid  and hydrochloric acid. Organic acid is obtained from plant and animal. The juice, which is obtained from plant and animal are mostly diluted acid because of the presence of water.

Some strong or concentrated acids are: Hydrochloric acid, sulphuric acid, nitric acid and phosphoric acid.

Some weak or diluted acids are: citric acid, acetic acid, carbonic acid, tartaric acid.    





      Every fruits contain acid. The acid found in fruits is called

(a) Strong acid

(b) Weak acid

(c) Mixed acid

(d) All of these

(e) None of these


Answer: (b)



      The formation of add by the chemical reaction of carbon dioxide and water is called?

(a) Strong acid

(b) Dilute acid

(c) Basic acid

(d) Sulphuric acid

(e) None of these


Answer: (b)

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