One statement is not true regarding the determination of pKa of Bromothymol Blue indicator by spectrophotometry. A. BIEN The absorption spectrum is the plot of absorbance against light wavelength and recorded by passing a light through a solution medium C. The Bromothymol Blue indicator solution is a weak acid composed of unionized acid and ionic conjugate base components B. According to Beer-Lambert law, the intensity of light absorbed or transmitted is directly proportional to the color of the indicator in the solution D. The color of Bromothymol Blue indicator changes by changing. the pH of the solution medium

One statement is not true regarding the determination of pKa of Bromothymol Blue indicator by spectrophotometry. A. BIEN The absorption spectrum is the plot of absorbance against light wavelength and recorded by passing a light through a solution medium C. The Bromothymol Blue indicator solution is a weak acid composed of unionized acid and ionic conjugate base components B. According to Beer-Lambert law, the intensity of light absorbed or transmitted is directly proportional to the color of the indicator in the solution D. The color of Bromothymol Blue indicator changes by changing. the pH of the solution medium

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Organometallic compounds of d-block elements

The transition metals can form complexes since they have vacant d orbitals. They are also termed Coordination compounds. The organometallic compounds of the transition metals could be used as catalysts as well as reagents. For example, organocadmium, organozinc, organocopper, Grignard are used as the reagents for several reactions. Most of the complexes of organo transition metals are used as catalysts for many organic transformation reactions.

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SPECTROPHOTOMETRY Two groups in a BIO 120 lab extracted a blue-violet pigment from mayana plant which was to be used as a natural dye for Philippine textiles. To determine the concentration of the pigment isolated, each group made a standard curve using commercially available indigo dye in dimethylsulfoxide (DMSO). The following data were obtained by the two groups: Table 4. Absorbance readings of standard solutions of varying concentrations of indigo dye in DMSO. Pure DMSO 0.115 Standard solutions (ppm) Group 1 Data Group 2 Data 0.2 0.398 0.224 0.4 0.563 0.437 0.6 0.732 0.603 0.8 0.833 0.811 1.0 1.008 0.966 1. Show the constructed standard curves of the two groups with proper figure titles. 2. Which of the two groups generated a better standard curve? Justify your answer by providing the R? value for each data set. 3. The extracted pigment has an absorbance of 0.983. When a 0.2 mL-aliquot of the extract was diluted to 1.0 mL, the absorbance of the diluted solution was found to be…
Would your absorbance value be too high or too low if the level of indicator were above the mark on the pipet when delivered to the flask? Explain your answer.
QUESTION 15 To improve the accuracy of our linear fit between absorbance and concentration, a. add an extra data point to your linear regression where you make the assumption that pure water has an absorbance of zero. b. make sure that you choose a "Linear Regression" curve fit. c. ensure that there are no air bubbles in the cuvette. O d. use the data points only at the lower end of the concentration range because Beer's Law is not applicable for higher concentrations. QUESTION 16 What laboratory equipment do you need to prepare a 0.250 M stock solution of NaCI? O a. buret, graduated cylinder, analytical balance b. beaker, volumetric flask O. volumetric pipet, analytical balance d. analytical balance, volumetric flask
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Absorbance is not proportional to which of the following? a. Intensity b. Molar Absorptivity c. Concentration d. Path Length