19. The following data were obtained during polarography of benzaldehyde C6H5CHO in a phosphate buffer solution:
-E,B 0.80 0.90 0.95 1.00 1.05 1.10 1.15 1.20
I, μA 0 0 0.35 0.13 2.25 2.45 2.50 2.50

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