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August 23, 2009 Lab Partner-Joey Stabel The Analysis of Alum K.Schuyler Elvir Malikic Purpose find out and understanding the characteristics of Aluminum Pre-Lab questions 1) When conclusion a melting point, why is it necessary to raise the temperature very(prenominal) late when approaching the melting temperature? When rise the temperature very slowly it gives the thermometer time to display the accurate temperature of the join giving you a more accurate reading. Another soil would be the visual of things changing in a slow-moving giving you time to examine whats happening. 2) Washing keynote is a render compound whose formula can be written Na2CO3·X H2O, where X is the topic of jettys of H2O per mole of Na2CO3. When a 2.123 g sample of washing soda is heated up at one hundred thirty°C, sole ly of the water system of hydration is lost leaving 0.789 g of anhydrous sodium carbonate. portend the value of X. a. 2.123gWashing Soda - 0.787gNa2CO3 = 1.336g H2O b. 1.336gH2O/0.787gNa2CO3= 1.68 c. (1.68) x (106gNa2CO3/1molNa2CO3)=179.135 d. (179.135) x (1molH2O/18gH2O)= 9.95 e. 9.95=X 3) The formula for epsom salts is MgSO4 7H2O. IF there is 1.

250 g of the compound is disolved in water,calculate the derive of milliliters of .200 M Ba(NO3)2 which would be r equired to just precipitate any o fthe sulf! ate as barium sulfate. a. MgSO4+Ba(NO3)2 ---> BaSO4+ Mg(NO3)2 b. Molar stool of MgSO4,7H2O is 246 c. 1.25/246 =0.0051moles d. 1 mL solution there is 0.2mM of Ba(NO3)2 e. 5.1/0.2 =25.5 mL 3) B 1.00f ALK(SO4)2x12H2O(1mole)(2mSO4) / (474grams) = .0042mBa (.0042mBa)(1m Ba(NO3))(1Liter)(1000ml) / (1m Ba)(.2mBa(NO3)2)= 21.1moles of...If you want to present a full essay, order it on our website: OrderCustomPaper.com

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