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August 23, 2009 Lab Partner-Joey Stabel The Analysis of Alum K.Schuyler Elvir Malikic Purpose determine 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 rearing the temperature very slowly it gives the thermometer time to display the accurate temperature of the signification giving you a more accurate reading. Another sympathy would be the visual of things changing in a sluggish giving you time to examine whats happening. 2) Washing tonic is a render compound 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 sample of washing soda is heat up at one hundred thirty° C, solely of the pee of hydration is lost leaving 0.789 g of anhydrous sodium carbonate. work 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 piece of milliliters of .200 M Ba(NO3)2 which would be requi red to just precipitate exclusively o fthe ! sulfate as barium sulfate. a. MgSO4+Ba(NO3)2 ---> BaSO4+ Mg(NO3)2 b. Molar portion 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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