The Peroxydisulfate Ion (S₂O₈^2-)reacts with the Iodide Ion in Aqueous

question 80

Multiple Choice

The peroxydisulfate ion (S₂O₈^2-) reacts with the iodide ion in aqueous solution via the reaction:
S₂O₈^2- (aq) + 3I^- → 2SO₄ (aq) + I₃^- (aq)
An aqueous solution containing 0.050 M of S₂O₈^2- ion and 0.072 M of I^- is prepared, and the progress of the reaction followed by measuring [I^-]. The data obtained is given in the table below.
-The average rate of disappearance of I^- between 1200.0 s and 1600.0 s is ________ M/s.

• A)1.8 × 10^-5
• B)1.2 × 10^-5
• C)2.0 × 10^-5
• D)5.0 × 10⁴
• E)1.6 × 10^-4

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