LAB_4 last year

LAB_4 last year - Instrumental Measurement Laboratory...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Instrumental Measurement Laboratory CHEE291 Department of Chemical Engineering McGill University Chemical Analysis TA for this lab: Ms. Lindsay Lessard Code number of the unknown sample is (2A)
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
CALCULATIONS A. Maximum soluble [NaNO 3 ] in mol/L solution: Since 1 liter/x liter = 1000 cm 3 / 1 cm 3 Therefore x = 1 L.cm 3 / 1000 cm 3 = 0.001L Solubility of NaNO 3 = 92.1g/ 100cm 3 H 2 O = 92.1g /0.1 L H 2 O = 921 g/ L Molecular weight of NaNO 3 = 84.99g/mol [NaNO 3 ] = (921 g/L)*(1 mol/ 84.99g) = 921 mol/84.99 L = 10.84mol/L B. To find the maximum possible (soluble) concentration of CuSO 4 in mol/L First, need to find the solubility of CuSO 4 at 25˚C Interpolation: (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)] = 74.53g/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: (0.5/2) mol/L = 0.25 mol/L Volume: 500 ml = 0.5 L # moles of CuSO 4 / total Volume = [CuSO 4 ] # moles of CuSO 4 = (0.25)*(0.5) = 0.125 mol Molecular weight of CuSO 4 .5 H 2 O = 249.68g/mol # mol = m/M Therefore, m = (#mol)*(M) = (0.125mol)*(249.68g/mol) = 31.21g D . The initial volumes for the solution of CuSO 4 C 1 V 1 = C 2 V 2 V 1 : unknown Therefore V 1 =C 2 V 2 / C 1 V 2 = 100 ml =0.1 L C 1 = (0.5/2) molCuSO 4 /1L = 0.25 molCuSO 4 /1L C 2 = (0.1/2) molCuSO 4 /1L =0.05 molCuSO 4 /1L V 1 = 0.02L (0.2/2) molCuSO 4 /1L = 0.1molCuSO 4 /1L V 1 = 0.04L (0.3/2) molCuSO 4 /1L = 0.15 molCuSO 4 /1L V 1 = 0.06L (0.4/2) molCuSO 4 /1L = 0.2 molCuSO 4 /1L V 1 = 0.08L Example with the first C 2: V 1 =C 2 V 2 / C 1 = (0.05)*(0.1)/(0.25) = 0.02L 2
Background image of page 2
RESULTS Some Calculation within the Experimental procedures In the spectrophotometer, the maximum absorbance occurs at a wavelength of 800 nm. 6) Absorbance and [CuSO
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 9

LAB_4 last year - Instrumental Measurement Laboratory...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online