Use this chemistry calculator to reproduce a named relationship with explicit quantities and units for study, laboratory planning, or an independent numerical check.

Ion concentration (mol/L)

Required number input.

Intercept (mV)

Required number input.

Slope (mV)

Required number input.

Compute the ion selective electrode potential from an intercept and slope applied to the log of the ion concentration. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Electrode potential (mV)

The resulting electrode potential returned as a number.

• Electrochemical relationships require consistent sign conventions, electron stoichiometry, electrode area, standard state, and temperature. Overpotential, internal resistance, mass transfer, side reactions, and non-unit activities are not automatically included.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check units and significant figures, compare the result with limiting cases, and use measured or source-specific constants where available. Laboratory, safety, and regulatory decisions require validated methods and appropriate uncertainty analysis.

• Standard Hydrogen Electrode Correction Calculator

  Correct electrode potential via Nernst E = E0 - (0.0592/n)*log(Q).

• Calibration Intercept

  Compute the calibration curve intercept from the low calibration point and the slope.

• Calibration Slope

  Compute the calibration curve slope from two concentration and response pairs.