Complete the table by entering the molarity of B2- for each standard solution. Show an illustrative calculation for tube ‘A’. Use the dilution formula and express each result to one more digit than allowed by applying the rules of significant figures. Standard Volume of stock B2- solution taken, mL Molarity of dilute B2 Construct a graph of Absorbance vs. molarity of B2- in Excel using the data in the preceding table. Make certain to title the graph and include axes labels with proper units. Absorbance is dimensionless (has no unit). Add a linear trendline to the graph but do not set the y-intercept to zero Solid M2B is added to 25 mL of water, the resulting mixture is continually stirred for 1 hour. At this point, it is assumed that equilibrium (eqn 3) has been established. The mixture is transferred to a test tube, and the test tube is centrifuged to assure that any residual solid M2B is fully settled out. A portion of the supernatant in the test tube is carefully withdrawn transferred to a cuvette and its absorbance determined: 0.0468 Determine the [B2-] by appropriate substitution of its measured absorbance into the regression equation. Report this result to one more digit than allowed by applying the rules of significant figures. Is absorbance ‘y’ or ‘x’ in the regression equation? Complete the following ICE table using the found [B2-].
Complete the table by entering the molarity of B2- for each standard solution. Show an illustrative calculation for tube ‘A’. Use the dilution formula and express each result to one more digit than allowed by applying the rules of significant figures. Standard Volume of stock B2- solution taken, mL Molarity of dilute B2 Construct a graph of Absorbance vs. molarity of B2- in Excel using the data in the preceding table. Make certain to title the graph and include axes labels with proper units. Absorbance is dimensionless (has no unit). Add a linear trendline to the graph but do not set the y-intercept to zero Solid M2B is added to 25 mL of water, the resulting mixture is continually stirred for 1 hour. At this point, it is assumed that equilibrium (eqn 3) has been established. The mixture is transferred to a test tube, and the test tube is centrifuged to assure that any residual solid M2B is fully settled out. A portion of the supernatant in the test tube is carefully withdrawn transferred to a cuvette and its absorbance determined: 0.0468 Determine the [B2-] by appropriate substitution of its measured absorbance into the regression equation. Report this result to one more digit than allowed by applying the rules of significant figures. Is absorbance ‘y’ or ‘x’ in the regression equation? Complete the following ICE table using the found [B2-].
Chemistry & Chemical Reactivity
10th Edition
ISBN:9781337399074
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter1: Basic Concepts Of Chemistry
Section: Chapter Questions
Problem 49RGQ: Fluoridation of city water supplies has been practiced in the United States for several decades. It...
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Complete the table by entering the molarity of B2- for each standard solution. Show an illustrative calculation for tube ‘A’. Use the dilution formula and express each result to one more
digit than allowed by applying the rules of significant figures.
Standard Volume of stock B2-
solution taken, mL Molarity of dilute B2
Construct a graph of Absorbance vs. molarity of B2-
in Excel using the data in the preceding table. Make certain to title the graph and include axes labels with proper units. Absorbance is dimensionless (has no unit). Add a linear trendline to the graph but do not set the y-intercept to
zero
Solid M2B is added to 25 mL of water, the resulting mixture is continually stirred for 1 hour. At this point, it is assumed that equilibrium (eqn 3) has been established. The mixture is
transferred to a test tube, and the test tube is centrifuged to assure that any residual solid M2B is fully settled out.
A portion of the supernatant in the test tube is carefully withdrawn transferred to a cuvette and its absorbance determined: 0.0468
Determine the [B2-] by appropriate substitution of its measured absorbance into the regression
equation. Report this result to one more digit than allowed by applying the rules of significant
figures.
Is absorbance ‘y’ or ‘x’ in the regression equation?
Complete the following ICE table using the found [B2-].
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