The Iodine "Clock Reaction" Involves the Following Sequence of Reactions

question 17

Multiple Choice

The iodine "clock reaction" involves the following sequence of reactions occurring in a reaction mixture in a single beaker. IO₃(aq) + 5I^-(aq) + 6H⁺(aq) → 3I₂(aq) + 3H₂O(l)
I₂(aq) + 2S₂O₃^2-(aq) → 2I^-(aq) + S₄O₆^2-(aq)
The molecular iodine (I₂) formed in reaction 1 is immediately used up in reaction 2, so that no iodine accumulates. In one experiment, a student made up a reaction mixture which initially contained 0.0020 mol of iodate ions (IO₃⁻) . If the iodate ions reacted completely, how many moles of thiosulfate ions (S₂O₃²⁻) were needed in reaction 2, in order to react completely with the iodine (I₂) produced in reaction 1?

• A)0.0020 mol
• B)0.012 mol
• C)0.0040 mol
• D)0.0010 mol
• E)0.0060 mol

Understand the structure and member composition of the International Accounting Standards Board (IASB).

Recognize the steps and challenges in the convergence of FASB and IFRS.

Identify factors that influence the development of a country's financial reporting practices.

Know the international organization that currently issues IFRS.

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