CHEM 142 Grossmont Determination of Rate Law and Activation Energy for The Iodine Clock Reaction Analysis

CHEM 142 Grossmont Determination of Rate Law and Activation Energy for The Iodine Clock Reaction Analysis

CHEM 142 Grossmont Determination of Rate Law and Activation Energy for The Iodine Clock Reaction Analysis

Determination of the Rate Law and Activation Energy for the Iodine Clock Reaction. A) Background: The Iodine Clock Reaction “Iodine Clock” refers to a group of reactions which involve the mixing of two colorless solutions to produce a solution which remains colorless for a precise amount of time, then suddenly changes to a deep purple-blue color. The time is controlled by the temperature and/or the concentrations of the reactants. The reactions involve the oxidation of iodide ion (I- ) to dissolved iodine (I2) or tri-iodide ion (I3 – ). Either of these combine with starch indicator to produce the characteristic purple-blue color. This color is visible to the eye when the concentration of iodine or tri-iodide ion ex1 attachmentsSlide 1 of 1

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Determination of the Rate Law and Activation Energy for the Iodine Clock Reaction. A) Background: The Iodine Clock Reaction “Iodine Clock” refers to a group of reactions which involve the mixing of two colorless solutions to produce a solution which remains colorless for a precise amount of time, then suddenly changes to a deep purple-blue color. The time is controlled by the temperature and/or the concentrations of the reactants. The reactions involve the oxidation of iodide ion (I-) to dissolved iodine (I2) or tri-iodide ion (I3-). Either of these combine with starch indicator to produce the characteristic purple-blue color. This color is visible to the eye when the concentration of iodine or tri-iodide ion exceeds 10-5 moles/liter. A typical reaction is: 6 H+ + IO3- + 8 I-  3 I3- + 3 H2O (Eq. 1) The rate of this reaction

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Determination of the Rate Law and Activation Energy for the Iodine Clock Reaction. A) Background: The Iodine Clock Reaction “Iodine Clock” refers to a group of reactions which involve the mixing of two colorless solutions to produce a solution which remains colorless for a precise amount of time, then suddenly changes to a deep purple-blue color. The time is controlled by the temperature and/or the concentrations of the reactants. The reactions involve the oxidation of iodide ion (I- ) to dissolved iodine (I2) or tri-iodide ion (I3 – ). Either of these combine with starch indicator to produce the characteristic purple-blue color. This color is visible to the eye when the concentration of iodine or tri-iodide ion ex1 attachmentsSlide 1 of 1

UNFORMATTED ATTACHMENT PREVIEW

Determination of the Rate Law and Activation Energy for the Iodine Clock Reaction. A) Background: The Iodine Clock Reaction “Iodine Clock” refers to a group of reactions which involve the mixing of two colorless solutions to produce a solution which remains colorless for a precise amount of time, then suddenly changes to a deep purple-blue color. The time is controlled by the temperature and/or the concentrations of the reactants. The reactions involve the oxidation of iodide ion (I-) to dissolved iodine (I2) or tri-iodide ion (I3-). Either of these combine with starch indicator to produce the characteristic purple-blue color. This color is visible to the eye when the concentration of iodine or tri-iodide ion exceeds 10-5 moles/liter. A typical reaction is: 6 H+ + IO3- + 8 I-  3 I3- + 3 H2O (Eq. 1) The rate of this reaction

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