36.7 Titrimetric analysis (Part 5)

36.7 How to monitor the rate of reaction : By Titrimetric analysis (Part 5) Follow the reaction by measuring change in concentration of (product / reactant) by titrimetric analysis at regular time interval A. What is titrimetric analysis ? Using titration to determine the conc of reactant / product at regular time interval Chemical reaction involved. ∴ Chemical method B. When to use? When one of the reactant / product is an acid / alkali / (O.A / R.A ) C. Steps for titrimetric analysis 1. Withdraw a small portion of reaction mixture with pipette at regular time interval 2. Quench the reaction 3. Titrate with another chemical IN SHORT : Withdraw, Quench, Titrate D. What is Quenching? Stopping the reaction, prevent further change in concentration of the chemicals E. How to Quench? 1. By cooling the reaction mixture (lower the temp) 2. By diluting the reaction mixture with cold water (lower the conc of reactant) 3. Remove the catalyst (e.g. some catalyst are solid , filter it) F. Example for titrimetric analysis Alkaline hydrolysis of ethyl ethanoate (Ester) Alkaline Hydrolysis : Break down with water in alkaline media G. Disadvantage of titrimetric analysis 1. The original reaction mixture is disturbed when small portions of the mixture are withdrawn for titrimetric analysis. 2. Continuous monitoring of the progress of the reaction is impossible