141. Solving a chemistry problem
A portion of the test water with a volume of 25.0 ml was diluted with distilled water in a 500.0 ml volumetric flask and photometric in flame in the same way as for standard solutions prepared from CaCl2. Photometry results are shown in the table:
CCa, mg / l 10.0 30.0 50.0 70.0 ???
Irel 16.0 47.6 80.2 111.0 32.0 76.9 101.8
Build a calibration graph and determine the concentration (mg / l) of calcium in the water under study.
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