The Terms

August 23, 2009 Lab Partner-Joey Stabel The Analysis of Alum K.Schuyler Elvir Malikic Purpose ascertain and understanding the characteristics of Aluminum Pre-Lab questions 1) When conclusion a melting point, wherefore is it necessary to raise the temperature very(prenominal) late when approaching the melting temperature? When summit the temperature very slowly it gives the thermometer time to display the accurate temperature of the amount giving you a more accurate reading. Another condition would be the visual of things changing in a slow giving you time to examine whats happening. 2) Washing daddy is a render compound whose formula can be written Na2CO3·X H2O, where X is the topic of gram molecules of H2O per mole of Na2CO3. When a 2.123 g sample of washing soda is het up at one hundred thi rty°C, solely of the pissing of hydration is lost leaving 0.789 g of anhydrous sodium carbonate. wait 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 issuing of milliliters of .200 M Ba(NO3)2 which wou ld be required to just precipitate all in a! ll o fthe sulfate as barium sulfate. a. MgSO4+Ba(NO3)2 ---> BaSO4+ Mg(NO3)2 b. Molar freshet 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

If you want to get a full essay, visit our page: write my paper