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Define acid,base,salt.

Acid : A sour tasting compound that releases hydrogen ion to form a solution into a p^H of less than 7, reacts with a base to form a salt and turns blue litmus red. Example : HCl, H₂SO₄, HNO₃ etc.

Base : A compound that releases hydrogen ions to form a solution with a p^H greater than 7, reacts with acids to form salts and turns red litmus paper to blue colour. Example : NaOH, CaCOHl₂, NH₄OH.

Salt : Salts are formed by the neutralisation reaction of an acid by a base. They are ionic compounds formed by a number of positively changed ions, cations and anions (negative ions) so that the product is electrically neutral. Example : NaCl, CaSO4 etc.