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to generate a linear graph.  (Hint: take the Nernst equation and rearrange to a straight line equation where  y= measured voltage; the b-int is the standard cell potential, what is the slope?, how will the concentration be graphed?)

to generate a linear graph.  (Hint: take the Nernst equation and rearrange to a straight line equation where  y= measured voltage; the b-int is the standard cell potential, what is the slope?, how will the concentration be graphed?)

Principles of Modern Chemistry
Principles of Modern Chemistry
8th Edition
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Chapter17: Electrochemistry
Section: Chapter Questions
Problem 76AP
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A:  Construct a graph of the measured voltage versus the copper ion concentration.  Comment on why this graph is not linear.

B:  Determine how the data might be manipulated to generate a linear graph.  (Hint: take the Nernst equation and rearrange to a straight line equation where  y= measured voltage; the b-int is the standard cell potential, what is the slope?, how will the concentration be graphed?)

Help with both parts please.

Electrochemical cells are sensitive to the concentrations of the reactants and products in the cell. As a result, electrochemical cells can be used to measure the concentrations of certain species in solution. For example, the voltage of an electrochemical cell based on the reaction: H2(g) + Cu2+, (aq)→2H*(aq) + Cu(s) is sensitive to both the concentration of copper ion and hydrogen ion in solution. If the hydrogen ion is held constant, then the voltage only depends on the copper ion concentration, and we can use the cell to measure the copper ion concentration in an unknown solution. (So instead of looking at absorbance and generating a calibration curve, we can measure voltage and relate to concentration to create a graph; however, this is not a direct linear relationship). The tabulated data show the measured voltage versus copper ion concentration in the hydrogen/copper electrochemical cell represented by the equation above. Examine the data in the table and answer the following questions.
Transcribed Image Text:Electrochemical cells are sensitive to the concentrations of the reactants and products in the cell. As a result, electrochemical cells can be used to measure the concentrations of certain species in solution. For example, the voltage of an electrochemical cell based on the reaction: H2(g) + Cu2+, (aq)→2H*(aq) + Cu(s) is sensitive to both the concentration of copper ion and hydrogen ion in solution. If the hydrogen ion is held constant, then the voltage only depends on the copper ion concentration, and we can use the cell to measure the copper ion concentration in an unknown solution. (So instead of looking at absorbance and generating a calibration curve, we can measure voltage and relate to concentration to create a graph; however, this is not a direct linear relationship). The tabulated data show the measured voltage versus copper ion concentration in the hydrogen/copper electrochemical cell represented by the equation above. Examine the data in the table and answer the following questions.
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