The concentration of phosphate ions in washing machine waste water can be determined using colourimetry.
A sample of washing machine waste water was collected and diluted by quantitatively transferring 1.00 mL of the solution to a volumetric flask and making up the volume to 1.000 L with distilled water.
Standard phosphate solutions were prepared and analysed with a colourimeter using an accepted method.
The standard calibration graph is shown.
The diluted sample solution was then analysed using the same method as the standard solutions. The absorbance of this solution was found to be 0.64 .
Determine the concentration of phosphate ions in the sample of washing machine waste water, in mol L
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