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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. The excess base required 4.20 ml of 0.1104 M HCl for back-titration. Calculate the concentration of Ba(OH)2 solution. 2. A 1.00mL aliquot of fish oil was 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 Example : Back (Indirect) Titration to Determine the Concentration of a Volatile Substance · Write the equation for the titration: · Calculate the moles, n, of NaA 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 Determination of Aspirin using Back Titration. This experiment is designed to illustrate techniques used in a typical indirect or back titration. You will. After cooling, the remaining HCl is back titrated with 21.0 mL of. 0.0978 M NaOH. Step 1 Write a balanced equation for both reactions. Step 2 Calculate the determine the excess amount by back-titration with a second standard titrant. Back-titrations are often required when the rate of reaction between the.