Section No. Name, CM131 Experiment #4 Post-Lab Questions violet in a solution wi

Question

Section No. Name, CM131 Experiment #4 Post-Lab Questions violet in a solution with an absorbance of o.295 when measured at A, in 1.00 cm cells. 1. Use the equation for your straight line fit (from the experiment) to determine the concentration of methyl The transition metal complex ion lRu(Bipyaru has a molar absorptivity of ?35-10" ????-1 (at a wavelength of 450 nm). Calculate the absorbance of a 1.80-10 M solution of (Rul(Bipyhl2 at 450 nm when measure in a 1.00 cm cell 2. 3. A2.50 10 M solution of a dye has an absorbance of 0.680 when measured in a 1.00 cm cell a decrease if the Calculate the %Transmittance of the solution, will the %Transmittance increase or concentration of the dye is increased

Explanation / Answer

2. A=elc

e = 1.35*10-4M-1cm-1

c= 1.8*10-5M

l=1cm

putting in equation we get

A= 1.35*10-4*1*1.8*10-5

Absorbance = 2.43*10-9

3.c=2.5*10-4M

A=0.680, l=1cm and lambda= 625nm

A= -log(T)

log(T)= -A

=-0.680

T = 0.209

%T= 20.9

A=elc

absorbance is directly propertional to concentration so if concentration is increased, absorbance will increase

and absorbance and transmittance are inversely proportional so transmittance will decrease!

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