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- Please answer 7-8 only. Thank you!(i) 1.03 2. DMS aT 1 1A chemist prepared a reagent blank and 6 Fe standards with the following concentrations: 20, 30, 40, 50, 60, and 70 ppm. The table below shows the average reading of each run in the UV-Vis spectrophotometer. Concentration (ppm)-- --Absorbance (au) -0.121 20- 30--- -0.302 40- -0.468 50- -0.573 60- --0.696 70--- -0.845 Blank- -0.04 Which of the following is the correct equation for the calibration curve? (A) y = -0.1700 x + 0.01402 (B) y = 0.01402 x -0.1700 Cy=0.01402 x -0.1300 (D) y=-0.1300 x + 0.01402
- Tube #: 2 3 4 mL 0.0120 M Pb(NO,), 5.00 5.00 5.00 5.00 2.00 3.00 4.00 5.00 mL 0.0300 M KI mL 0.20 M KNO, 3.00 2.00 1.00 0.00 Total vol. (mL) 10.00 10.00 10.00 10.00 Absorbance of soln. 0.381 0.420 0.470 0.542 [I] at equilibrium (M)Need answerrrWhat is ln(A) be with reference to ln(A) vs. time graph? What would 1/A be with reference to 1/A vs. time. graph? Trial 1 Time (s) Absorbance 0 0.600 30 0.522 60 0.454 90 0.392 120 0.344 150 0.300 180 0.261
- What is difference between SPE and DSPE?Calculate the Absorbance from concentration for each trial of 0,10, 30, 40, 50 % (with yellow LED) Absorbance=−log(Percent Transmittance/100) - did my best with transmission ruler, do the numbers look rightA chemist prepared a reagent blank and 6 Fe standards with the following concentrations: 20, 30, 40, 50, 60, and 70 ppm. The table below shows the average reading of each run in the UV-Vis spectrophotometer. Concentration (ppm)-- -Absorbance (au) 20- -0.121 30- -0.302 40- -0.468 50- -0.573 60- -0.696 70 -0.845 Blank- -0.04 Which of the following is the correct equation for the calibration curve? (A) y = -0.1700 x + 0.01402 B y = 0.01402 x - 0.1700 C) y = -0.1300 x + 0.01402 (D) y = 0.01402 x - 0.1300