3. A pH electrode system is calibrated with standard buffer solutions, with the following voltages observed for each: pH 4.01 111 mV; pH 7.00 = -55 mV; ph 10.01 = -215 mv. The electrode system generates a response of -30 mV when analyzing a soil solution. What is the pH of the solution? (

3. A pH electrode system is calibrated with standard buffer solutions, with the following voltages observed for each: pH 4.01 111 mV; pH 7.00 = -55 mV; ph 10.01 = -215 mv. The electrode system generates a response of -30 mV when analyzing a soil solution. What is the pH of the solution? (

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter21: Potentiometry

Section: Chapter Questions

Problem 21.29QAP

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Concept explainers

Potentiometric Titrations

Potentiometric titration is one of the important titration methods and is mainly carried out to characterize acid solutions. It follows a method similar to that of the normal titration technique, but the main difference is that there is no indicator used in the potentiometric titrations. Instead of using an indicator, electrodes are employed for monitoring the whole titration process. A scientist named Robert Behrend did the potentiometric titration for the first time, and it was done using the mercurous solution and potassium chloride.

Question

3. A pH electrode system is calibrated with standard buffer solutions, with the following voltages
observed for each: pH 4.01 = 111 mV; pH 7.00 = -55 mV; ph 10.01 = -215 mv. The electrode
system generates a response of -30 mV when analyzing a soil solution. What is the pH of the
solution? (

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