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Unformatted text preview: Q# Question Text 7) Part II. Data Entry No Scoring. Now you will enter your absorbance readings for the bromothymol blue standard solutions at the wavelength of the maximum absorbance for thymol blue, 434 nm . Please enter the 5 absorbance readings in corresponding order of solution concentration (high concentration to low concentration; values of absorbance will be running in the same sense, high absorbance to low absorbance and expressed to 3 significant figures). The concentrations shown are your calculated values from Part I for the bromothymol blue standard solutions. Your Answer: 0.1320 No Points Possible Your Answer: 0.1030 No Points Possible Your Answer: 0.0740 No Points Possible Your Answer: 0.0510 No Points Possible Your Answer: 0.0230 No Points Possible 8) Part II. Scoring Scheme: 3321 Plot absorbance versus concentration in mol/L of the bromothymol blue at the wavelength of the maximum absorbance of thymol blue, 434 nm , on a spreadsheet or a programmable calculator, and carefully determine the slope of the best straight line fit through the data. Using this Beer's Law plot, you will determine the value of * BT . The slope must be accurately determined because it will enable you to solve for the unknown concentrations of your mixture components. CLICK HERE if you would like assistance using an Excel spreadsheet for determining the slope of a best fit line. Enter the value of your slope to 3 significant figures and in units of L/mol. Slope (L/mol) = Your Answer: 0.0058 You Scored 3 points out of 3 Possible 9) Part II. Data Entry No Scoring. Now you will enter your absorbance readings for the thymol blue standard solutions at the wavelength of the maximum absorbance for thymol blue, 434 nm ....
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This note was uploaded on 04/10/2010 for the course CHE 2a taught by Professor Tingguo during the Winter '08 term at UC Davis.
 Winter '08
 tingguo
 Chemistry

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