Sodium thiosulfate, Na2S2O3, is used as a "fixer" in black and white photography. Identify the reducing agent in the reaction of thiosulfate with iodine. 2S2O32-(aq) + I2(aq) → S4O62-(aq) + 2I-(aq)
A) I 2( aq)
B) I −( aq)
C) S 2O 3 2−( aq)
D) S 4O 6 2−( aq)
E) S 2O 3 2−( aq) and I −( aq)
Correct Answer:
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