electrochemical analysis pH measurement pH sensing CHMO:0002354 batchelorc The measurement of pH, the negative logarithm to base ten of the hydrogen ion activity in a solution. Operationally the pH of a solution X, pH(X), is measured relative to that of a standard reference solution, pH(S), and defined as pH(X) = pH(S) - (E(X) - E(S))/(RT/F)ln 10, where E(X) and E(S) are the electromotive forces measured in cells containing the solution X and the reference solution respectively. measurement of pH 2009-09-11T11:37:04Z sensing of pH