Consider an iron nail with magnesium wrapped onto it, immersed in an agar gel containing phenolphthalein and potassium ferricyanide. After a few minutes a pink colour appeared in the gel around the iron nail and but no blue colour was observed in the gel. What is the most accurate interpretation of these observations?

Question

Answer

Magnesium is oxidised producing Mg 2 + (aq). Water is reduced at the nail to produce OH – (aq).

Answer

Iron is oxidised along the shaft of the nail, producing Fe 2+ (aq). Water is reduced at the magnesium to produce OH – (aq).

Answer

Magnesium is oxidised producing Mg 2+ (aq). Oxygen is reduced at the nail to produce OH – (aq).

Answer

Iron metal is oxidised, producing Fe 2+ (aq). Oxygen is reduced at the magnesium to produce OH – (aq).

Answer

Iron is oxidised producing Fe 2+ (aq). Mg 2+ (aq) is reduced producing magnesium metal.

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Consider an iron nail with magnesium wrapped onto it, immersed in an agar gel co...

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