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Conceptual Question 4B - applied to a column The mobile...

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Concept Question #4B In a typed paragraph, describe how ion exchange chromatography was used in this experiment to determine the identity of an unknown ionic compound. Include in your discussion the terms resin, mobile, and stationary phase. Inorganic salts can be altered so that their analysis can be simplified and then quantitatively studied by titration through their conversion into acids or bases using ion-exchange resin. Ion-exchange chromatography was used in this experiment to change an inorganic salt into an acid so it could be titrated. Ion-exchange is done in two phases: the mobile phase and the stationary phase. The stationary phase includes a large amount of acid groups attached to a polymeric resin that is stirred with water and
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Unformatted text preview: applied to a column. The mobile phase consists of the unknown salt dissolved in deionized water. As the mobile phase passes through the column, exchange between the H+ ions on the polymeric ion-exchange resin and the cations of the salt in the mobile phase occur. The solution that was then collected at the bottom of the column contained an acid form of the salt. This solution was titrated using a standardized base to determine the number of moles present in the sample (<http://www.vanderbilt.edu/AnS/Chemistry/courses/chem104/experiment4/ionexchange.htm>, Sept. 28, 2008). It was from this experimental value of moles that the molecular weight of the substance and the thus the identity of the unknown was calculated....
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