The reaction H2SeO3(aq) 6I(aq) + 4H+(aq) 2I3(aq) + 3H2O(l) + ...

[cartlidgeashley]

The reaction H₂SeO₃(aq) 6I^–(aq) + 4H⁺(aq) → 2I₃^–(aq) + 3H₂O(l) + Se(s) was studied at 0°C by the method of initial rates:

[H2SeO3]0	[H+]0	[I–]0	Rate (mol/L s)
1.0 × 10–4	2.0 × 10–2	2.0 × 10–2	1.66 × 10–7
2.0 × 10–4	2.0 × 10–2	2.0 × 10–2	3.33 × 10–7
3.0 × 10–4	2.0 × 10–2	2.0 × 10–2	4.99 × 10–7
1.0 × 10–4	4.0 × 10–2	2.0 × 10–2	6.66 × 10–7
1.0 × 10–4	1.0 × 10–2	2.0 × 10–2	0.41 × 10–7
1.0 × 10–4	2.0 × 10–2	4.0 × 10–2	13.4 × 10–7
1.0 × 10–4	4.0 × 10–2	4.0 × 10–2	5.33 × 10–6

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The rate law is

 

Reference: Ref 12-5

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◦ Rate = k[H₂SeO₃][H⁺][I^–]
◦ Rate = k[H₂SeO₃][H⁺]²[I^–]
◦ Rate = k[H₂SeO₃][H⁺][I^–]²
◦ Rate = k[H₂SeO₃]²[H⁺][I^–]
◦ Rate = k[H₂SeO₃][H⁺]²[I^–]³

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[harveenkau8139]

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[cartlidgeashley]

Wow, this really help

[blakcmamba]

YES! Correct, THANKS for helping me on my review