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titrate the excess acid with 0.1 N sodium hydroxide VS. Perform a blank determination (see “titrant 1” is determined indirectly with residual titration. A back titration, or indirect titration, is generally a two-stage analytical technique: a. Reactant A of unknown concentration is reacted with excess Summary of Back Titration steps: 1. Work out the moles of reactant used in total (here, the acid). 2. Calculate the moles of acid unreacted This capacity can be determined by a technique called back-titration. A known amount of antacid is dissolved in an excess of HCl, and then the excess acid EXAMPLES of BACK TITRATIONS. 1. The quantity of organically bound nitrogen (org-N) released by acid digestion is referred to as Kjeldahl nitrogen. You will use the NaOH you standardized last week to back titrate an aspirin solution and determine the concentration of aspirin in a typical analgesic tablet.The resulting mixture is then titrated back, taking into account the molarity of the excess which was added. Uses of Back Titration: ❖ When the sample is not Back titration. In the back titration, the sample is mixed with a defined amount of reagent A. Reagent A must be present in excess. After a reaction. PDF. Page by: Sunil Kumar Singh. Back titration is also titration. It is called back titration because it is not carried out with the solution whose