Practice i. four standard solutions of a hydrated copper complex are prepared from a 5.0 m stock solution. each standard solution is prepared by measuring a different volume of stock (indicated in the table below) that is diluted to a volume of 10.00 ml·the absorbance of each standard solution is measured at 610 nm and the absorbance is recorded in the data table below. the absorbance of a hydrated copper complex of unknown concentration is measured to be 0.579. calculate the concentration of each of the four standard solutions and determine the concentration of the unknown solution. volume of concentration of 5.0 m stock 10.00 ml standard standard 0.40 ml 0.60 ml 0.80 ml 1.00 ml absorbance 0.31 0.49 0.67 0.84 2 2. four standard solutions of potassium permanganate (kmno,) are prepared from a 1.00 mm stock solution. each standard solution is prepared by measuring a different volume of stock (indicated irn the table below) that is diluted to a volume of 25.00 ml. the absorbance of each standard solution is measured at 520 nm and is recorded in the data table below. the absorbance of an unknown kmno solution is measured to be 0.153. calculate the concentration of each of the four standard solutions and determine the concentration of the unknown solution. volume of standard 1.0 mm stock concentration of 25.00 absorbance ml standard 0.50 ml 1.00 ml 2.50 ml 5.00 ml 0.053 0.101 0.252 0.461