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Rate of formation or consumption in 3I- + S2O8 2- to I3- + 2SO4 2- from the rate of SO4 2- formation

The same question, asked 4 times: 4 May 2023 S1*, 9 May 2023 S1, 10 May 2024 S1, 19 Apr 2026 S2. Every wording below, oldest first.

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  1. Question 1

    4 May 2023 S1

    86
    For the reaction, 3I−(aq)+S2O82−(aq)→2SO42−(aq)+I3−(aq)3\text{I}^-(aq) + \text{S}_2\text{O}_8^{2-}(aq) \to 2\text{SO}_4^{2-}(aq) + \text{I}_3^-(aq). Rate of formation of SO42−\text{SO}_4^{2-} is 0.044 mol dm−3 s−10.044\text{ mol dm}^{-3}\text{ s}^{-1}. Calculate rate of consumption of I−(aq)\text{I}^-(aq).

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  2. Question 2

    9 May 2023 S1

    80
    Consider the reaction 3I−+S2O82−→I3−+2SO42−3\text{I}^- + \text{S}_2\text{O}_8^{2-} \rightarrow \text{I}_3^- + 2\text{SO}_4^{2-}, at a particular time tt, d[SO42−]dt\frac{d[\text{SO}_4^{2-}]}{dt} is 2.2×10−2 mol dm−3 s−12.2\times10^{-2}\,\text{mol\,dm}^{-3}\,\text{s}^{-1}. What is the value of d[S2O82−]dt\frac{d[\text{S}_2\text{O}_8^{2-}]}{dt}?

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  3. Question 3

    10 May 2024 S1

    87
    For 3I−+S2O82−→I3−+2SO42−3\text{I}^-+\text{S}_2\text{O}_8^{2-}\to\text{I}_3^-+2\text{SO}_4^{2-}, at time t, d[SO42−]dt=2.2×10−2\frac{d[\text{SO}_4^{2-}]}{dt}=2.2\times10^{-2} mol dm−3^{-3} s−1^{-1}. Value of −d[I−]dt-\frac{d[\text{I}^-]}{dt} is

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  4. Question 4

    19 Apr 2026 S2

    32
    Consider the reaction, 3I(aq)−+S2O82−(aq)⟶I3−(aq)+2SO42−(aq)\mathrm{3I^-_{(aq)} + S_2O_8^{2-}{}_{(aq)} \longrightarrow I_3^-{}_{(aq)} + 2SO_4^{2-}{}_{(aq)}} If the rate of formation of SO42−\mathrm{SO_4^{2-}} at a particular time is 2.2×10−2 mol dm−3 s−12.2 \times 10^{-2}\ \mathrm{mol\,dm^{-3}\,s^{-1}}. Calculate the rate of consumption of I−\mathrm{I^-}.

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