A Petri dish is filled with an unreactive gel that contains Fe(CN)6 (ag), phenolphthalein (which turns...

 

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A Petri dish is filled with an unreactive gel that contains Fe(CN)6³ (ag), phenolphthalein (which turns pink in the presence of hydroxide ions), and liquid water. An iron nail is placed in the Petri dish and is exposed to oxygen gas in the air. After a few hours, the nail begins to corrode. The diagram below represents the changes that occur in the Petri dish. The dark blue areas are caused by the formation of Fe3 [Fe(CN)6]2(aq), which contains Fe²+ (aq) ions. Select one: O2(g) + 4H+ The pink/red color in the gel around the nail is produced by the phenolphthalein reacting with products from which of these half-reactions? a. 2H₂O (1) → b. O2(g) + 2H₂O(1) +4e c. O2(g) + 4H+ (aq) + 4e¯ → d. O2(g) + 2H+ (a (aq) + 2e → → (aq) + 4e Petri dish Dark blue 40H*(aq) 2H₂O(1) H₂O (1) Pink/red Nail Dark blue Unreactive gel (clear/colourless) A Petri dish is filled with an unreactive gel that contains Fe(CN)6³ (ag), phenolphthalein (which turns pink in the presence of hydroxide ions), and liquid water. An iron nail is placed in the Petri dish and is exposed to oxygen gas in the air. After a few hours, the nail begins to corrode. The diagram below represents the changes that occur in the Petri dish. The dark blue areas are caused by the formation of Fe3 [Fe(CN)6]2(aq), which contains Fe²+ (aq) ions. Select one: O2(g) + 4H+ The pink/red color in the gel around the nail is produced by the phenolphthalein reacting with products from which of these half-reactions? a. 2H₂O (1) → b. O2(g) + 2H₂O(1) +4e c. O2(g) + 4H+ (aq) + 4e¯ → d. O2(g) + 2H+ (a (aq) + 2e → → (aq) + 4e Petri dish Dark blue 40H*(aq) 2H₂O(1) H₂O (1) Pink/red Nail Dark blue Unreactive gel (clear/colourless)

Answer rating: 100% (QA)

ANSWER c O 2 g 4 H aq 4 e 2 H 2 O EXPLANATION The transfer of electrons from one atom to another i... View the full answer