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{"ops":[{"insert":" (A)  \nA solid sample, containing the element copper, Cu, was quantitatively analysed\nby atomic absorption spectroscopy using the following procedure: 0.5250 g of the sample were\ndissolved in an appropriate solvent system which was then diluted to 50.0 cm3 5.0 cm3\nof this solution were then diluted to 100.0 cm3This 100.0 cm3 of solution was then divided into 5 separate equal volume aliquots with each aliquot being placed in separate 50.0 cm3volumetric flasks. Various volumes of a standard stock solution of Cu (concentration = 250 ppm) were then added to these flasks and all the flasks were then diluted to volume after the additions. The resulting solutions were then analysed for Cu using an atomic\nabsorption spectrophotometer.\n                                                                                                                                               The following measurements were obtained:\n\nAtomic Absorbance                Volume of 250 ppm Cu added to flasks (cm3)\n0.22                                        0.0\n0.42                                        0.4\n0.63                                         0.8\n0.84                                         1.2\n1.04                                         1.6\nUse the data to calculate the % Cu in the original solid sample. (12 marks)\n\n\n"}]}

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