Acid , Bases and Salts are important groups of chemical compounds which are useful to us in many ways.
Acids are sour substances that are acidic in nature.
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   For Example -
   
The stomach makes an acid (Hydrochloric acid) which is necessary for digestion of food. 
Bases are bitter chemical compounds. They are said to be basic in nature .
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   For Example -
   
Baking soda (sodium hydrogen carbonate) used in baking bread is a base. 
Some substances are neither bitter nor sour . These compounds can be categorized as salts .
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   For Example -
   
Common salt(sodium chloride) used in cooking food is a salt. 
We cannot always determine whether a substance is acidic or basic using taste or touch .
We use indicators for this purpose.