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pH Equation:
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The MV to pH conversion calculates pH values from millivolt (mV) readings obtained from pH electrodes. This conversion is based on the Nernst equation and is essential for interpreting pH meter measurements accurately.
The calculator uses the pH equation:
Where:
Explanation: The equation converts the electrical potential difference (mV) from a pH electrode into the corresponding pH value based on the electrode's calibration parameters.
Details: Accurate pH measurement is crucial in various fields including chemistry, biology, environmental science, food processing, and medical diagnostics. Proper conversion from mV to pH ensures reliable results in analytical measurements.
Tips: Enter the electrode offset potential (E0) in mV, the measured mV reading, and the electrode slope value. The default slope value is set to 59 mV/pH (Nernstian slope at 25°C), but this should be adjusted based on your specific electrode calibration.
Q1: What is the typical value for electrode slope?
A: The theoretical Nernstian slope is approximately 59.16 mV/pH at 25°C. Actual electrode slopes typically range from 55-59 mV/pH and should be determined through calibration.
Q2: How do I determine the E0 value for my electrode?
A: E0 is determined during electrode calibration using buffer solutions. It represents the mV reading when the pH equals 7.00 (isopotential point).
Q3: Why does the slope value change?
A: Electrode slope can vary with temperature, electrode age, and condition. Regular calibration is necessary for accurate measurements.
Q4: Can I use this calculator for any pH electrode?
A: Yes, but you must use the correct E0 and slope values specific to your electrode as determined by calibration with standard buffer solutions.
Q5: What if I get unexpected results?
A: Check your electrode calibration, ensure proper storage and maintenance of the electrode, and verify that all input values are correct.