A substance which ionizes to form Hydronium ion is called ACID. A substance which forms (OH-Hydroxyl ion is BASE 
Any ionic compound whose anion comes from an acid and whose cation comes from a base is SALT i.e ACID + BASE = SALT + WATER Hope it helps ya :)

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1to5ph level is acid ,,,5to11ph level is called base and 11to above is Sault

Acids: Acids are sour in taste, turn blue litmus red and give H3O+ ion (hydronium ions in solution. e.g. HCl, H2SO4, HNO3 etc

Bases: Bases are bitter in taste, have soapy touch, turns red litmus blue and give hydroxide ions (OH-) in solution. Example - NaOH, KOH etc

Salts: A salt is a compound which is formed by neutralisation reaction between an acid and base. For example, sodium chloride is formed by reaction between hydrochloric acid and sodium hydroxide.

Acid + base -->   Salt + water

HCl+NaOH--> NaCl+H2O

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