PH .MEASUREMNT

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 Have no text to check? Click "Select Samples".Thus pH, may be.defined ng negative loglrilnrnic to base I O-of the reciprocity of (he hydrogen ion concentration. It Is a measure of the acidity or alkalinity or solution. All values of acidity and alkalinity with respect to hydrogen and 

hydroxide ions can be expressed by a series of positive numbers between 0 and 14. Thus, a natural ~solution (like pure water) with [H+] = 10-7 has a pH of 7. If the pH is less than 7, the-solution is acid, if greater than 7. the solution is alkaline. Therefore. pH scale can range from Otto 14 in which the pH value lies between 0 to 7 for acidic solutions and between 7 to 14 fur alkaline solution's. 

pH measuring devices measure tho effective concentration, or activity. of the hydrogen ions and not the actual concentration. In very dilute solutions of dectrolyte the activity and concentration are identical. As the concentration of electrolyte in solution increases above 0.1 mollitre, the measured value of pH becomes a less reliable measure of the concentration of hydrogen ions. In addition, as the concentration of a solution increases, lhe degree of dissociation of the electrolyte decreases.