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    Introduction
    This Application Note is the second in a series relating to the eQCM 10M™ and assumes that
    you have read and understand the material covered in the Application Note, Basics of a
    Quartz Crystal Microbalance.
    The purpose of this Application Note is to show the reader a simple experiment where we
    reduce Cu2+onto an Au electrode and then oxidize Cu back off. We will then use the result to
    calculate a calibration factor for the crystal. Conversely, we will show you how to calculate the
    molar mass of the species deposited using a calibration factor.
    Each crystal has a theoretical calibration factor, however, under typical experimental
    conditions, these calibration factors will vary slightly. We will use Cu2+ to calculate a
    calibration factor which could then be used in subsequent experiments on the same crystal.
    Cu2+ is reduced in a two electron reaction as shown below:

    CuSO4(aq) + 2 e- →Cu(s) + SO42-(aq)
    Our goal is to reduce Cu2+ onto an Au electrode, then use the frequency decrease and the
    charge passed to calculate a calibration factor.

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