The Iodine "Clock Reaction" Involves the Following Sequence of Reactions $\rightarrow$

question 87

Multiple Choice

The iodine "clock reaction" involves the following sequence of reactions occurring in a reaction mixture in a single beaker.
1. IO₃¯(aq) + 5I¯(aq) + 6H⁺(aq) $\rightarrow$ 3I₂(aq) + 3H₂O(l)
2. I₂(aq) + 2S₂O₃²¯(aq) $\rightarrow$ 2I¯(aq) + S₄O₆²¯(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) 0.0030 mol
• C) 0.0040 mol
• D) 0.0050 mol
• E) 0.0060 mol

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Definitions:

Inflation Rate

The percentage increase in the general level of prices for goods and services in an economy over a period of time, often measured annually.

Natural Rate

Often referred to as the natural rate of unemployment, it is the level of unemployment consistent with a stable rate of inflation.

Unemployment

Unemployment is the state of being without a job despite actively looking for work, reflecting the portion of the labor force unable to find gainful employment.

Friedman-Phelps Analysis

The Friedman-Phelps analysis introduces the concept of the natural rate of unemployment, arguing that inflation and unemployment rates are not linked in the long term due to adaptive expectations.