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Unformatted text preview: (Mg(NH 4 )PO 4 )6H 2 O, and filter off precipitation using suction filtration. 10. Wash the precipitate with two 5-mL portions of isopropyl alcohol. 11. Suck air through filter for about 20 minutes to help dry the precipitate and then carefully scrape it onto a pre-weighed watch glass, making sure to get all of the precipitate. 12. Let the precipitate dry in air for half an hour and weigh the watch glass with precipitate. If the precipitate is not dry, dont weigh it. 13. While you are waiting for the product to dry, perform a second trial by the previous steps. 14. Measure the mass of the product and use this to determine the % P 2 O 5 in the sample. 15. Show how you will use the mass of (Mg(NH 4 )PO 4 )6H 2 O formed to calculate the percent P 2 O 5 in the original sample. 16. Ideally, you should have at least three significant figures in your final percent of P 2 O 5 ....
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This note was uploaded on 10/20/2011 for the course ENGIN 200 taught by Professor Miller during the Spring '11 term at University of Cincinnati.
- Spring '11