10th Class Science Acids, Bases and Salts Acid, Bases and Salts

Acid, Bases and Salts

Category : 10th Class

 Acids, Bases and Salts

           

  • Acids

The term acid has its origin in the latin word acidus, meaning sour.

 

  • An acid is a substance that has a sour taste. It is defined as a compound which contains replaceable hydrogen in it.

 

  • Acids that contain both hydrogen and oxygen are called oxyacids.

 

  • Acids that contain hydrogen and other non-metallic elements except oxygen are called hydracids.

 

  • Properties of Acids

Acids have a sour taste, turn blue litmus to red, conduct electricity and react with metals to form salt and hydrogen gas.

 

  • Bases

A base is a substance, usually the oxide or the hydroxide of a metal, which can react with an acid to produce salt and water.

 

  • Alkalis are bases that are soluble in water.

 

  • The strength of a base is determined by the amount of hydroxide ions that the base provides when dissolved in water.

 

  • Properties of Bases

Bases have bitter taste, soapy to touch, turn red litmus to blue and react with metals to form hydrogen gas.

 

  • pH Scale

In 1909 Sorensen devised a scale (known as pH scale) on which the strength of acid solutions as well as basic solutions could be represented by making use of the hydrogen ion concentrations in them.

 

  • The pH of a solution is inversely proportional to the concentration of hydrogen ions in it. In the term pH, letter 'p' stands for a German word 'potenz' which means 'power' and letter H stands for hydrogen ion concentration\[[{{H}^{+}}]\]

(i) Acids (or acidic solutions) have a pH of less

than 7.

(ii) Bases (or basic solutions) have a pH of more

than 7.

(iii) Neutral substances have a pH of exactly 7.

Notes - Acid, Bases and Salts
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