الفهرس 
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Abstract
According to Bronsted and Lowry(1,2), an acid is a species having a tendency to lose a portion, and a base is a species having tendency to accept a proton, this may be represented as : A ---- H+ + B acid = = = = proton + conjugate base H+ symbol represents the proton, and the definition is therefore independent of the solvent. Acids need not be a neutral moleculw but can also be anions (e.g. HSO4-, H2PO4-) or cations (NH4+, C6H5NH3+), since the free proton can not exist in solution in measurable concentrations. So an acid solution ionize to an appreciable extent if there is a basic medium present to accept the proton which is being lost.