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Determination of the concentration of alkaline detergent in the water of washing bathtubs and machines

For analysis use a special graduated test tube with a lower mark "A" and the upper "B".

The course of determination. To the bottom mark “A”, 10 ml of test water is poured and 2 drops of a 1% solution of phenolphthalein are added. Alkaline water turns pink-red. After that, 0.1 N HCl solution was added dropwise, stirring the contents of the tube all the time.

If the liquid is discolored when acid is added below the upper “B” mark, then the concentration of the alkaline detergent in the water of the washing bath is less than the lower limit of the norm (0.5%).
This concentration of the washing solution is insufficient for degreasing the dishes.

If bleaching occurs at the level of the “B” mark and higher, then the concentration of alkaline detergent in the water is 0.5% and higher, which ensures high washing efficiency.

Test tube graduation. 10 ml of a 0.5% sodium hydrogen carbonate solution (Na2CO3) are poured into a test tube and 2 drops of a 1% phenolphthalein solution are added. At the level of this fluid, the label “A” is applied. Then, a 0.1 N HC1 solution was added dropwise and when the liquid became colorless, a label “B” was added.
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Determination of the concentration of alkaline detergent in the water of washing bathtubs and machines

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