The Equilibrium Constants for a Diprotic Acid Are Determined from a Bjerrum

question 10

Multiple Choice

The equilibrium constants for a diprotic acid are determined from a Bjerrum plot by:

• A)fitting the theoretical curve to the experimental curve by adjusting the pH values to minimize the square of the residuals.
• B)determining the slope for the upper curve which corresponds to K₁,and the slope for the lower curve which corresponds to K₂.
• C)varying the pH to determine the range over which the slope of the theoretical curve is zero.Lower end of range is K₁ and upper end of range is K₂.
• D)fitting the theoretical curve to the experimental curve by the method of least squares to find the values of K₁ and K₂ that minimize the square of the residuals.
• E)taking the first derivative of the experimental data to determine minimums in slope.Each minimum is an equilibrium constant.

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