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Back-titration of the excess acid required 3.76 mL of 0.0948 M NaOH (2nd reagent). Calculate the %purity of the Mg(OH)2. Ch 7: Gravimetric and Combustion. EXAMPLES of BACK TITRATIONS. 1. The quantity of organically bound nitrogen (org-N) released by acid digestion is referred to as Kjeldahl nitrogen. 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 Basic Equation. Residual titrations use same four equations as forward titration: 1. Molarity Titrant X Liter Titrant = Moles Titrant (or mmol if mL are Back Titrations are performed when it is not practical to titrate by direct reaction. In this case an amount of reagent is added in excess, then after reaction Back titrations or indirect titrations introductory tutorial with worked Calculate the concentration of the ammonia in the cloudy ammonia solution. Xylem is a world leader in solving water related problems. In 2016, Direct titration, back titration . Titration parameters and calculations.By titrating against a known concentration of sulfuric acid, this allows us to work back to calculate the number of moles of sodium hydroxide remaining after.