A pH meter represents the hydrogen ion concentration in pH units. A pH
meter consists of a glass electrode and a read out screen. The glass electrode
is made of very thin glass that establishes and measures the electrical potential
difference between the analyte solution (the solution to be measured) and an
internal reference. The electrical potential is then converted into a pH reading
for the sample.
Hydrogren ion concentration can be calculated from the pH of a solution using
the following equation:
[H+] = 10(exp -pH)
A glass electrode. In the electrode shown, the glass
is set in a plastic holder to protect it.
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