2.12 The following data were obtained in a standard calibration for the nation o

Question

2.12 The following data were obtained in a standard calibration for the nation of copper, as Cu(NH,)", by measuring the transmittance u filter photometer. using a 96T Cu conc. (ppm) 0.800 1.00 1.40 2.00 3.00 4.00 %T Cu conc. (ppm) 0.020 0.050 0.080 0.100 0.200 0.400 0.600 96.0 90.6 84.7 81.4 66.7 47.3 35.8 27.8 23.2 17.2 12.9 9.7 8.1 Calculate A, the absorbance, for each solution and plot A against concentration of copper. (You can do this using a spreadsheet program very easily.) Does the system, measured under these conditions, conform to Beer's Law entire concentration range? Is any deviation from the law of small or of large magnitude? Suggest a plausible cause for any deviation. over the

Explanation / Answer

since A =2-log (%T)

the data on % T is converted to Absorbance as per the above equation .

the plot of A vs concentration is genrated and shown below.

Beers law is A= ebC

So the relation between Absorbance vs concentration has to be linear for Beers law to be obeyed. so the law is not obeyed over the entire concentration range. The variation is significant at higher concentrations of Cu.

Related Questions

Navigate

• Browse (All)
• Browse 2
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.