Experiment 3, web - Analysis of a Mixture of Carbonate and...

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3 2 3 2 CO H H HCO + + - 3 2 2 3 2 CO H H CO + + - O H CO OH HCO 2 2 3 3 + + - - - 2 3 3 2 3 2 ) ( 2 OH Ba OH Ba BaCO CO Ba + + - + - + Analysis of a Mixture of Carbonate and Bicarbonate Introduction The purpose of this lab was to introduce students to a common technique called titration. It also introduces students to the idea of using primary and secondary standards. In this lab, students determine the amount of two carbonate species via an indirect titration method. Procedure Each titration repeated until three good trials obtained The acid and base were standardized by titrating NaOH with KHP and water. About 0.5 g of KHP was measured out since it was the amount that would require at least 25 mL of the titrant (in this case, NaOH) and mixed with water to create a liquid solution. Three samples of 2.0-2.5 g of unknown were diluted to the mark and freshly boiled and cooled with triply distilled water. Next 25.0 mL of the unknown was placed in a 250 mL Erlenmeyer flask and titrated with standardized HCl and bromocresol green. Next 25.0 mL of unknown and 50.0 mL of standard NaOH were placed in a 250 mL Erlenmeyer flask. Then 10 mL of 10 wt% BaCl
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Experiment 3, web - Analysis of a Mixture of Carbonate and...

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