Review methods of end-point determination for acid base quantitative volumetric analysis

Abstract

Some methods of end-point determination for acid-base quantitative volumetric analysis were reviewed. Three methods were considered. These include the Visual Indicator, Potentiometric and Conductometric methods. Sodium Carbonate (Na2C03) was titrated against Hydrochloric Acid (HCI) using each of the mentioned methods. Comparison of the methods in terms of advantages and disadvantages and estimation of the numerical uncertainty in the results was made. Using a concentration of O.05004M of Na2C03 the molarity of the Na2C03 solution in the colour indicator was found to be between 0.05025 and 0.05015 with an error of between 0.22% and 0.42% as against 0.02%-0.14% for the potentiometric method. The conductometric method showed an error of between 0.12% and 0.18%. The relative deviations of all three methods showed that they fell within acceptable limits. However, the potentiometric method was found to be more superior to the other methods as it gave the least error