lab4 version 2003

lab4 version 2003 - DarrenNathan LorenOlshansky RakyLy...

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Darren Nathan Loren Olshansky Raky Ly Mandjee Nayyara INSTRUMENTAL MEASUREMENT LABORATORY Chemical Analysis Laboratory TA : Devin O’Grady 19/11/2007 Team 14 and 17 Code number of the unknown sample :
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Page 2 of 10 Introduction The purpose of the laboratory experiment is to identify the composition of the liquid solution containing unknown amounts of two ionic salts. Also, to udestand the principle of the spectrophotometer and the refractometer and to be able to analyze calibration curves. The ionic salts used in the experiment are sodium nitrate (NaNO 3 ) and cupric sulfate (CuSO 4 ). To indentify the concentration of CuSO 4 and NaNO3 in a liquid solution a spectrophotometer is used to find the absorbance of solutions with different concentrations of CuSO 4 . Using the data from the spectrometer a standard calibration curve will be plotted from the different concentrations and the index of refraction measured by the refractometer.
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Page 3 of 10 Calculations A. Maximum possible (soluble) concentration of NaNO 3 in mol/L solution : Assumption: ideal solution MW of NaNO 3 : 84.99 g/mol Solubility of NaNO 3 = 92.1g/ 100cm 3 H2O Since 100 cm 2 = 0.1 L Solubility of NaNO 3 = 92.1 g/0.1L= 921 g/ L Concentration of NaNO 3 (mol/L) = (921 g/L)*(1 mol/ 84.99g) = 921 mol/84.99L [NaNO 3 ]= 10.84mol/L B. Maximum possible(soluble) concentration of CuSO 4 in mol/L solution : Assumption: ideal solution MW of CuSO 4 : 249,68 g/mol To find the solubility of CuSO 4 at 25°C we have to do an interpolation:
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Page 4 of 10 Solubility of CuSO 4 at 25°C= (31.6g/0.1L+ (25 C -0 C/100 C ˚ ˚ ˚ -0 C)*(203.3 g/0.1L -31.6g/0.1L))= ˚ 745.3g/L Concentration of CuSO 4 in 1mol/1L (745.3g/L)[(1mol CuSo 4 .5H 2 0)/(1mol of CusO 4 )](1mol/249.68g) = 2.99mol/L C. Concentration = 0.25 mol/ L : MW of CuSO4.5 H2O: 249,68 g/mol [CuSO 4 ]= number of mole of CuSO
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This note was uploaded on 11/15/2010 for the course CHEE 638 taught by Professor Hampton during the Spring '10 term at MO Southern.

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lab4 version 2003 - DarrenNathan LorenOlshansky RakyLy...

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