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The Sulfur Clock

The Sulfur Clock. Pre-Lab and Chemical Kinetics Review. It is known that the thiosulfate ion, S 2 O 3 2- ( aq ) , decomposes in the presence of the hydrogen ion, H + ( aq ) , in the following manner S 2 O 3 2- ( aq ) + 2H + ( aq )  S (s) + H 2 SO 3( aq ). What is the rate law equation?.

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The Sulfur Clock

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  1. The Sulfur Clock Pre-Lab and Chemical Kinetics Review

  2. It is known that the thiosulfate ion, S2O32-(aq), decomposes in the presence of the hydrogen ion, H+(aq), in the following manner • S2O32-(aq) + 2H+(aq) S(s) + H2SO3(aq) What is the rate law equation?

  3. When sulfur is produced it makes the solution opaque. • When the solution becomes opaque it is no longer possible to see through it. • You will use this fact to determine the reaction time, which is defined in this experiment to be the time when you no longer see a mark on a piece of paper under the flask. We will determine the effect of concentration!

  4. What effect do you think concentration will have on the rate of reaction? • WHY? Hint: relate this to collision theory

  5. Temperature • Surface Area • Chemical Nature of the reactant • Catalysts • Provide an alternate pathway with a LOWER activation energy to increase the rate of reaction Other factors Affecting Rate

  6. At 25C a catalyzed solution of formic acid produces 44.2 ml of carbon monoxide gas in 30 seconds. • Calculate the rate of reaction with respect to CO(g) production. • What can you say about how long you would expect the production of the same volume without a catalyst? Determining rate of reaction

  7. The average rate of a reaction over a period of time is the absolute value of the slope of a straight line drawn between two points Using a graph to determine the Average Rate of Reaction

  8. The average rate is inversely related to the elapsed time (ie. longer time, slower rate) • The rate of a reaction in which some reactant A is consumed is: • A graph will help determine the order of reaction (n) See Pg. 378 Relating Reaction Rate to Time (useful in clock reactions)

  9. Complete Pre-Lab handout • Read page 378, pg 381#5 • If you are finished…Review! (Text pg. 408 #6-9, 14) …Lab Tomorrow

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