Lab 3 Report

Lab 3 Report - I. Introduction The objective of this...

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1 I. Introduction The objective of this experiment was to determine the number of molecules of H 2 O of hydration in alum and to determine the complete chemical formula for the reaction. The water content needs to be determined quantitatively. The function of synthesis was taught during this lab experiment. Synthesis is the process of combining two compounds into a new whole compound. Alum was the main compound synthesized in this experiment. Household uses for Alum include dyes, medication treatment, and tanning. The Alum used was Potassium Aluminum Sulfate , which is a double salt. The chemical formula for the Alum is KAl(SO 4 ) 2 * xH 2 O. The xH 2 O in the Alum is called water of hydration . To determine the number of water of hydrations, we used the gravimetric method , which uses weights as measurements. When working with synthesis, good results are determined by yield . High yield and high purity company good synthetic procedures. II. Experimental Week 1: · An aluminum beverage can was cut open and the ends were removed so that all that was left was the metal rectangular center. · The paint was rubbed off the aluminum by using steel wool. · The metal center was then washed and dried thoroughly. · The metal piece was cut into ½” squares. · A 100 mL beaker was tarred on the top-loader balance and exactly 1.00 g of Al was weighed out and then added to the beaker. · After that, 40 mL of 1.5 M KOH (aq) was added to the beaker containing Al. For this reaction, fizzing and bubbling was present followed by a white solution. · The beaker was then placed onto a hotplate. While on the hotplate, the solution turned dark brown and the ½” squares of Al dissolved into the solution. A white cloud appeared for a few minutes in the beaker but slowly faded away.
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1 · During the reaction described above, the filtration apparatus was assembled with a 500 mL Buchner flask and a funnel. The apparatus was clamped to the stand, as it is not too stable. A piece of filter paper was placed on the funnel and in order for the paper to stick to the funnel a couple drops of distilled water were put on the paper. · The beaker was taken off the hotplate and allowed to cool so it could be handled easily. · The solution was filtered to get rid of any suspended solids. The solution had a slight yellow tint to it. · The water was turned on and a hose was used to connect the water vacuum on the sink to the sidearm of the Buchner flask. · The solution was then washed out with under 5mL of distilled water and then poured onto the filter paper. · The vacuum was turned off once the liquid came through the filter. · The filtrate was transferred to a clean 250 mL beaker and 5 mL of distilled water were used to wash out the previous flask and the solution was added to the new beaker with the filtrate. · An ice bath was creating using 200 mL of ice and 200 mL of tap water.
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This note was uploaded on 04/23/2008 for the course CH 109 taught by Professor Brunker during the Spring '07 term at BU.

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Lab 3 Report - I. Introduction The objective of this...

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