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On adding two or three drops of FeCl_(3) into the excess of solution (A) a violet coloured compound (D) is formed. This colour disapperars quickly. |
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Answer» `S_(2)O_(3)^(2-)+Fe^(3+) underset((D)" violet")(RARR) [Fe^(3+)(S_(2)O_(3))_(2)]^(-)` `[Fe(S_(2)O_(3))_(2)]^(-)+Fe^(3+) rarr 2 Fe^(2+)+S_(4)O_(6)^(2-)` |
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