QUESTION 4 A 0.7203 M copper solution has an absorbance of .805. What is the cal

Question

QUESTION 4 A 0.7203 M copper solution has an absorbance of .805. What is the calculated absorbance for a 0.3498 M copper solution? QUESTION 5 1 points Save Given the following values were obtained from a UVVis instrument set to 625nm, what is the absorbance of the solution? Blank 99.6%; Standard 51.6% QUESTION 6 1 points Save A 0.0641 M solution was prepared by dissolving copper wire (AW 63.546) in nitric acid and diluting to volume in a 100mL volumetric flask with distilled water. What was the mass of the copper wire?

Explanation / Answer

Q4

Beer’s Law

A = e*l*C

A = absorbance of sample

e is the molar absorptivity , the typical units are 1/M-cm

l size of cuvette, typically reported in cm

c is the molar concentration, in mol per ltier or M

then

A1 = e*l*C1

0.85 = e*l*(0.7203)

e*l = 0.85 /0.7203 = 1.1800

then

A2 = e*l*C2

A2 = 1.1800*0.3498

A2 = 0.412764 M

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