n :  a solution that usu. contains on the one hand either a weak acid (as carbonic acid) together with one of the salts of this acid or with at least one acid salt of a weak acid or on the other hand a weak base (as ammonia) together with one of the salts of the base and that by its resistance to changes in hydrogen-ion concentration on the addition of acid or base is useful in many chemical, biological, and technical processes .
 
 
 
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