This lab report covers on the employment of gravimetric analysis in the mass determination of chlorine within an unknown chloride solution. I determining the mass percent of chlorine, apure precipitate containing chloride ions must be prepared. Aong the elements that form insoluble chlorides include Pb2+, H22+ and Ag+ (Smith and Stanton, 114). Tis experiment used silver because it is not only easily filtered and readily available, bt also undergoes 99.99% conversion from Ag to silver chloride. Cloride ions are made by dissolving chlorine in nitric acid. O the slver ions are contained within a solution of silver nitrate.
Inic equation for the reaction is written as; I order to improve the percentage conversion and formation of AgCl, apropriate reaction conditions are maintained, wich include but not limited to use of excess silver nitrate, ad sustenance of temperatures at approximately 95oC. Ater precipitation of AgCl(s), sfficient washing and filtration procedures are employed to increase the precipitate’s purity before the pure compound is dried and weighed. Frst, fur filter crucibles were cleaned by rinsing with a mixture of 15 deionized water and 6M nitric acid.
Sbsequently, te four crucibles were dried at 120oC for approximately 2 hours, ad their individual mass recorded to 0. Te unknown samples were first dried at 120oC for 2 approximately 2 hours and the cooled in desiccators before weighing 0. 4grams of the sample into each dried crucible (Smith and Stanton, 114). Sbsequently, ech weighed sample was quantitatively transferred into a 400 ml beaker, ad the sample in the beaker dissolved with a mixture of 200 ml water and 5 ml of M acid.
Uon complete dissolution of the sample, 02 M silver nitrate was added into the beakers and stirred until a precipitate began to coagulate. Wile the temperature was maintained at 95oC for 10 minutes, ecess silver nitrate was added into the beaker and continually stirred until formation of the precipitate ceased. Te resultant precipitate was carefully decanted into one of the weighed filter crucibles and dried at 110oC for 2 hours. Eentually, te dry precipitate was cooled, wighed, ad its mass recorded in the data table (Smith Stanton, 114).
a means of enhancing precision, fur independent trials of the entire process were repeated, ad the mass of each pure. ..
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