Fundamentals of ChemistryDOE-HDBK-1015/1-93ACIDS, BASES, SALTS, AND pHRev. 0CH-01Page 51Example:The hydroxyl concentration [OH ] of a water solution at 25 C is- o7.2 x 10 moles/liter. Calculate the pH of the solution.-9Solution:TABLE 5Ion Product Constant and Neutral pH for Water at Various TemperaturesTemperatureIon Product ConstantpH of Purefor WaterWaterFC64.4180.64 x 107.10-1477251.0 x 107.00-14140608.9 x 106.54-142121006.1 x 106.10-133021502.2 x 105.83-123922005.0 x 105.65-124822506.6 x 105.59-125723006.4 x 105.60-126623504.7 x 105.66-12At 25?C, an equilibrium exists between pure molecular water and its ions. The [H ] equals the+[OH ] and both have values of 1 x 10 moles/liter. Using the pH definition, it follows that the- -7pH of pure water at 25?C is 7. pH values less than 7 indicate an acidic solution and valuesgreater than 7 indicate a basic or alkaline solution.
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