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Question: please help on know 15 ppm and molarity...

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did not assign an unknown, students sitting at the east bench (near the door) should use unknown A, students at the middle bench should use unknown B, The table below solutions are to be prepared for colorimetric analysis and students at the west bench should use unknown C. summarizes the way that the 6 standard solutions, the stock solution from the tablet, and the unknown iron Solution mL o-phen mL 40.00 ppm Fe2+ stock 1 mL Hydroxylamine HCI mL 10% sodium Known I Known 2 Known 3 Known 4 Known 5 Known 6 1.00 mL 1.50 mL 2.00 mL 3.00 mL 4.00 mL 5.00 mL Unknowns and acetate 1.00 mL 1.00 mL 1.00 mL 1.00 mL 1.00 mL 1.00 mL mL 10% sodium 1.00 mL 1.00 mL 1.00 mL .00 mL 1.00 mL mL Hydroxylamine 1.50 mL 1.50 mL 1.50 mL 1.50 mL 1.50 mL 1.50 mL mL o-phen HCI 1.00 mL 1.00 mL Blank: mL acetate 1.50 mL 1.50 mL 1.50 mL 1.00 mL Tron Supplement1.50 ml (or other) Stock Solution Unknown Fe2+ Solution Blank 5.00 mL 1.00 mL 1.00 mL 1.00 mL Allow all solutions to stand for at least ten minutes before measuring their absorbance. Set the colorimeter at 508 nm and use the procedure described in Operating the Colorimeter at the end of this experiment. 26

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Please help on know 1-5 ppm and molarity

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