Using a pipette take 10 ml of sample solution added to 100ml flasks, small add 5 drops of 4 PP directive. and titrate with dd A5 (0.1N H2SO4) until the sample turned from pink to colorless. Ml dd A5 number used is the number of free alkalinity (F.Al). Often F.Al = 30 45 points.
In the production process, freedom F.Al alkalinity decreases. To increase F.Al up 1 point to use about 1.5 kg LPCLEANER P38-E for 1000L solution.
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