Analysis of Soda Ash and Volumetric Analysis of a Carbonate-Bicarbonate Mixture

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Analysis of Soda Ash and Volumetric Analysis of a
Carbonate-Bicarbonate Mixture
Manalo, Ma. Cristina Joyce B.
Department of Chemical Engineering, Faculty of Engineering
University of Santo Tomas
Espana, Manila

A. Abstract

Crude sodium bicarbonate or commonly known as soda ash may contain amounts of impurities like chlorides and hydroxides. The total acid neutralizing capacity of a soda ash sample, its alkalinity value, was stated in terms of mass of sodium carbonate. In doing so, any sodium hydrogen carbonate present in the sample was converted to its equivalent neutralizing capacity in terms of sodium carbonate. A mass of the impure sample was dissolved and diluted in distilled water. 3 drops of indicator was mixed and the
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Preparation of 0.10 M HCl 500 mL of distilled water was measured and put to a beaker. 4.2 mL of concentrated HCl was added carefully and slowly to the beaker. The solution was stirred and then transferred into a labelled storage bottle. b. Standardization of NaOH Two burets were prepared and with one buret, 20 mL of the standard NaOH was transferred into a dry container. 3 drops of methyl orange were added. The acid buret was filled with the acid to be standardized and the acid was titrated with the base until the formation of an orange-colored solution. c. Analysis of the Carbonate-Bicarbonate Mixture The electrode was rinsed with distilled water and was immersed carefully into the specified buffer. The acid buret was filled up with the standard acid (HCl). The initial volume of the acid was recorded. A 2.00 gram of solid sample was weighed and dissolved and diluted with distilled water in a volumetric flask. A 50.0 mL aliquot was measured and 3 drops of phenolphthalein were added. The electrode was immersed to the solution and was titrated with acid. The volume of the HCl used to obtain a pink-colored solution was recorded. 3 drops of the methyl orange were added to the same mixture. The volume of the acid used to obtain an orange-colored solution was recorded. E. Results and Discussion I. Analysis of Soda Ash
Standardization of NaOH | Trial 1 | Trial 2 | Volume of NaOH | 20.0 mL | 20.0 mL | Final Volume of HCl |

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