5 Questions
Explain how the addition of HCO3- can push the reaction forward in the context of the given chemical equation and explanation?
The addition of HCO3- removes H+ ions, which lowers the potential of the AsO43-/AsO33- system, allowing arsenite to be oxidized quantitatively by iodine.
How can the presence of excess I2 push the reaction forward in the Fe3+/ Fe2+ system?
Excess I2 lowers the oxidation potential of the I2/I- system, allowing I- to be oxidized quantitatively into iodine.
Explain how the addition of F- or phosphate can push the reaction backward in the I2/2I- system & Cu2+/Cu+ system?
The addition of F- or phosphate forms complexes with Fe3+, lowering the oxidation potential of the I2/2I- system, which pushes the reaction backward.
What is the expected behavior of Cu2+ salts in the context of the given chemical equations?
Cu2+ salts liberate iodine from iodides, despite the expectation that cuprous compounds would reduce iodine into iodide.
How does the increase of H+ ions push the reaction backward in the context of the given chemical equations and explanation?
The increase of H+ ions increases the oxidation potential of the AsO43-/AsO33- system, causing arsenate to oxidize iodide in the presence of systems with oxidation potentials near that of the iodine/iodide system.
Learn about the standard oxidation potential of the I2/I- system at 25°C and its significance in iodimetric and iodometric methods of analysis. Understand how reducing agents and oxidizing agents are involved in these methods.
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