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Alkalinity Tests

There are three different tests used for testing alkalinity, usually performed in this order: The pH alkalinity test will indicate the presence or absence of hydroxide alkalinity. A pH reading of 8.3 or above indicates the presence of hydroxide alkalinity. The phenolphthalein test measures "P alkalinity" which is made up of all hydroxide alkalinity plus 1/2 of the carbonate alkalinity. The Methyl Orange test measures the "M alkalinity" which is the remaining 1/2 of the carbonate alkalinity plus all of the bicarbonate alkalinity. See Also: Base Alkali Alkalinity Hydroxide Alkalinity Detergent Methyl Orange Methyl Orange Alkalinity Phenolphthalein Phosphate Soap Base Alkali Alkalinity Hydroxide Alkalinity Detergent Methyl Orange Methyl Orange Alkalinity Phenolphthalein Phosphate Soap