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18 August, 15:40

Briefly describe how a potentiometric pHmeter works. (Hint: Describe how the pH meter

measures the amount of H + or OH - ions in a sample)

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  1. 18 August, 16:04
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    A potentiometric pH meter is used to measure the pH of a solution.

    Explanation:

    A pH meter is an common instrument that is used to measure the hydrogen-ion concentration in aqueous solutions, the meter indicates its acidity or alkalinity and is expressed as pH.

    The pH meter measures the difference in electrical potential between a pH electrode and a reference electrode, hence the pH meter is often called a potentiometric pH meter. The difference in electrical potential is related to the pH of the solution.

    Potentiometric pH meters consists of a simple electronic amplifier and a pair of electrodes, alternatively it may consist of a combination electrode, and some form of display calibrated in pH units. It usually has a glass electrode and a reference electrode, or a combination electrode. The electrodes, or probes, are inserted into the solution to be tested and pH values are read off.
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