Chemistry · Oct / Nov 2016 · Paper 21 · Question A4
5070
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A4 Peroxodisulfate ions, S2O8 2–, react with iodide ions in aqueous solution. S2O8 2–(aq) + 2I–(aq) 2SO4 2–(aq) + I2(aq) The table shows how the relative rate of this reaction changes when different concentrations of peroxodisulfate ions and iodide ions are used. experiment concentration of S2O8 2– in mol / dm3 concentration of I– in mol / dm3 relative rate of reaction 1 0.008 0.02 1.7 2 0.016 0.02 3.3 3 0.032 0.02 6.8 4 0.008 0.04 3.4 5 0.008 0.08 6.9
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A4(a)[2]
A4(b)[1]
A4(c)(i)[1]
A4(c)(ii)[1]
A4(c)(iii)[2]
A4(d)[1]
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