From the graph, which shows the relationship between the concentration of CuCl2 and color intensity CUPRAC reagent showed that when added to the increased concentration of CuCl2. The intensity of the color reagent was increased by CUPRAC to a lower value, and when the intensity high point at the starting signal, CuCl2 has changed the most is the concentration of approximately 4 mM in CuCl2, this selection with the intensity of 4 CuCl2 mM is the optimum concentration to be used as the initial concentration in the reaction with antioxidants, because they can see the change clearly signals when the CUPRAC reagent react with antioxidants, little and the intensity of the CUPRAC reagent.
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