Please show calculations Do the following calculations using a stock standard Al

Question

Please show calculations

Do the following calculations using a stock standard Alphazurine solution of 1.454 x 10–4 M.

1. A 10.00 mL sample of this solution is diluted to 100.0 mL in a volumetric flask. Determine the concentration of the working standard.

2. Calculate the concentration of a dilution made by mixing 2.00 mL of working standard with 6.00 ml of distilled water in a large test tube

3. Calculate the absorbance of the dilution prepared in Question #2 if the Spec 20 is set to a baseline of 98.0 %T and the dilution reads 41.3 %T.

4. A Beer’s Law calibration plot for Alphazurine produced a linear regression equation of y = 97927x + 0.0198. An unknown solution of Alphazurine is found to have an average%T of 26.9% when the baseline is set to 98.0%T. Calculate the molarity of the unknown solution.

5. Keep in mind that the slope of the regression equation is equal to “ab” in the Beer’s law equation of A = abc + intercept. What is the absorptivity, “a” if the pathlength is 1.00 cm?

Explanation / Answer

1.
M1V1=M2V2
(1.454*10^-4M) (10.00mL) = (100.0mL)M2
M2 = (1.454*10^-4*10)/100
M2 = 1.454*10^-5 M

2.
M1V1=M2V2
(1.454*10^-4M) (2.00mL) = (6.00mL)M2
M2 = (1.454*10^-4*2)/6
M2 = 4.847*10^-5 M

3.
A = log(98.0%T / 59.2%T)
A = log(1.655405405)
A = .219

5.
y= 57794x+0.0049
ab= 57794
a (1.00) = 57794
a = 57794 mol/L

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