1. Calculate Al concentration (mg/ml) based on the following data:
Solution Current at E=-1.7 V, µA
20.0 ml 0.2 M HCl 20 ml water 10.0 µA
20.0 ml 0.2 M HCl 10 ml sample solution 10 ml water 33.0 µA
20.0 ml 0.2 M HCl 10 ml sample solution 50 ml 6.32*10-2 M Al3 solution 5.0 ml water 51.7 µA
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