Weak acids and bases and its salts are determined with back-titration or substitute-titration
technique of neutralisation method.
Back-titration is a process, when an excess of a standard solution used to react with an
analyte is determined by titration with a second standard solution.
Substitute-titration is a process in which a standard solution used to react with an additional
(substitute) substance, amount of which is equivalent an analyte amount.