2CLabManual201303

Centrifuge the tube after each washing and discard

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Unformatted text preview: __ _______ _______ ________ Question 2. The precipitate from Question 1 is washed twice, first with a 1 mL portion of 1 M NaOH (you will make your own) and then with 1 mL of deionized water. Centrifuge the tube after each washing and discard the two supernatant liquids. Now treat the precipitate with 1 mL of 6 M HNO3 and heat the centrifuge tube briefly in a water bath. The centrifuge tube is then centrifuged, and the supernatant liquid is decanted and saved. (The Ca(OH)2 produced in Question 1 is acid soluble.) At this stage of the experiment the elements that could be found in the decanted liquid are: _____ ______ ______ _______ _______ _______ _______ _______ ________ The elements that could be found in the remaining precipitate are: _____ ______ ______ _______ _______ _______ _______ _______ ________ Question 3. The precipitate from Question 2 is treated with 1 mL of 6 M HNO3 followed immediately by the drop-wise addition of 3% hydrogen peroxide until the precipitate fully dissolves. The centrifuge tube is heated in a water bath until bubbling ceases. At this stage of the experiment the elements that could be found in the resulting liquid are: _____ __...
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This note was uploaded on 04/09/2013 for the course CHE CHE 2C taught by Professor Nasiri during the Spring '07 term at UC Davis.

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