Question

Font Paragraph 2. You are provided 50.0 mL of the 0.200M CoCl2 stock solution. With this stock solution prepare 5 dilutions to produce a series of known concentration solutions. Show all dilution calculations below. Type or draw the equations and solution concentrations. (10) 3. Utilizing the data below to calculate the absorbances of your dilutions from part 2. Known Concentration % Transmittance 0.20 0 0.18 13 0.16 16 0.14 20.1 0.12 26 4. Type your concentrations into the data table below. Generate a graph of your dilution data from part 2 above. Absorbance Solution Concentration OM (blank) (5) When finished, start calculating the data below, based on your dilution data from part 2 Equation R? Perform the best linear regression using Graphing calculator or Excel and report your regression equation in terms of the variables studied. Include the value of R2 Using your regression equation, Beer's Law, and only necessary information that is common to all your trials, calculate the value of the molar absorption coefficient. Show your calculation. Describe in words or type out the equation.

Answer 1

answer:

I new Solm stock To 7 Nis,= v Sj Viz vol. of stock som. ,Na = Vol. of how eone Siz Strength of Sy Strength of Prepared from a> 50x 0.200 = V x 0.20 [ Ist délection] ON, N = 50ml. . Here no water is added. thicks on blaut) y 50x 0:2 = V₂ x 0.18 [and dilection] or V2 = 55.555 ml. [ 5.5 bul Hao is added] 7 50x0.2 = Vox 0.16 [3nd délution] ON, N2 = 62.5 ml [ 12.5ml H2O is added ] dy 50x0.2 z Ve x 0.14 [ 44th dilution] or V₂ = 71.43 ul [ 21:43 ml HO is added] ey 50*0.2= N * 0.12 [5th dilation] or, N2 = 83.33 nel [ 33.33ml H2O is added] kuseen love %. Trausmittance Absorbanel--log (400) p. 201 1. 0 uit 0:18 0.16 - 13 16 111 0.88606 0.79588 0.69680 0.58503 in 0.14 20.) 0.12 26

solution (Cone.) Absorbance OM (blauk) 0.20 1. 0.18 0.88606 8.16 » 0.79588 0.14 - 0.69 680 0:12 0.58503 From the plot bellow Equationis, y= R² = 0.998 = 5.0964 -0.022 2

plott (absorbance vs concentration)

Concentration(M)	Absorbance
0.2	1
0.18	0.88606
0.16	0.79588
0.14	0.6968
0.12	0.58503

1.1 y = 5.096x -0.022 R? = 0.998 1 0.9 0.8 -Series1 0.7 0.6 in 0.1 0.12 0.14 0.16 0.18 0.2 0.22