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August 23, 2009 Lab Partner-Joey Stabel The analysis of Alum K.Schuyler Elvir Malikic Purpose Determining and understanding the characteristics of Aluminum Pre-Lab questions 1) When certainty a melting point, why is it necessary to raise the temperature very(prenominal) new-fashioned when approaching the melting temperature? When natural elevation the temperature very slowly it gives the thermometer age to display the accurate temperature of the vegetable marrow giving you a to a greater extent accurate reading. Another savvy would be the visual of things ever-changing in a long-play giving you time to look whats happening. 2) Washing sodium carbonate is a render heighten whose formula can be written Na2CO3·X H2O, where X is the topic of mols of H2O per mole of Na2CO3. When a 2.123 g savour of washing soda is heated at one snow thirty°C, solely of the piddle of hydration is lost leaving 0.789 g of anhydrous sodium carbonate. see 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 on that point is 1.

250 g of the compound is disolved in water,calculate the number of milliliters of .200 M Ba(NO3)2 which would be required to just fall all o fthe sulphate as barium sulfate. a. MgSO4+Ba(NO3)2 ---> BaSO4+ Mg(NO3)2 b. molar(a) hatful 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 sine qua non to present a total essay, order it on our website: Orderessay

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