question about potentiometry. A combined pH probe is used to measure the pH of a

Question

question about potentiometry. A combined pH probe is used to measure the pH of an unknown solution. The pH probe was calibrated by putting it into a buffer of pH 4.01. giving a reading of +0.437 V. Why should pll calibration be done at the same temperature of the analyte? What is the pH of a sample solution giving a reading of +0.308 V? If there is an uncertainty of 0.01 in the buffer pH and 0.005 V in each potential measurement, is it possible to tell the pH of the sample solution in (b) accurate to the second decimal place? Explain. Explain why the pH probe should not be put into the sample solution for prolonged time.

Explanation / Answer

a) PH calibration should be done at the same temperature of the analyte in order to minimize error.

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