Precipitation Titration - Click to edit Master subtitle...

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Unformatted text preview: Click to edit Master subtitle style Precipitation Titration Kimberly Hargraves Titration is a process by which the concentration of an unknown substance in solution is determined by adding measured amounts of a standard solution that reacts with the unknown. Objectives  To use the silver nitrate solution to identify an unknown chloride salt  The unknown amount of Chloride in the solution was determined because the amount of AgNO3 was known. The titrate used in this lab was the AgNO3 solution. Q: What is precipitation titration?  In a precipitation titration, the stoichiometric reaction is a reaction which produces in solution a slightly soluble salt that precipitates out.  Another way: A precipitation titration is a titration in which as you proceed toward the end point, the substance of interest is precipitated out solution as an insoluble salt. Materials  Volumetric flask  Funnel  Silver nitrate solution (~0.2 M)  Dextrin  Dichlorofluorescein indicator  Chloride unknown 0.2M silver nitrate standardization against sodium chloride  Silver nitrate solutions of known concentration can be prepared from known mass of dried AgNO3.  First step: Calculate the molar concentration and measure the approximate measure of AgNO3  For a 0.02 M of Silver ion, 1.8 g of AgNO3 For a 0....
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Precipitation Titration - Click to edit Master subtitle...

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