1. Calculate the percentage of aluminum in a technical product by photometric determination by the method of additives as part of a complex with the sodium salt of 2-quinalizarine sulfonic acid under the following conditions:

Weight of sample, g Volume of aliquot Components Volume of colored solution, ml Optical density
Al3, µg/ml Reagent, ml H2O, ml
4.97 (dissolved in 500 ml) 25.0
25.0 0
5.0 20.0
20.0 5.0
0 50.0
50.0 0.389
0.514

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