17. When polarizing on a mercury drop electrode against the background of a 1 M solution of hydrochloric acid, the following data were obtained
Negative 0.01 0.05 0.08 0.09 0.1 0.11 0.14 0.19
Potential, V
Current, μA 1 1.4 2 3 6 10 12.7 13.7
Plot a graph and determine which element is present in the solution [21].

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