Consider the following statements regarding the iodine clock reaction. Determine

Question

Consider the following statements regarding the iodine clock reaction. Determine whether each statement is true or false. The rate of the reaction is determined by measuring the amount of time needed for all of the arsenious acid to be consumed by triiodide. The solution must be buffered because relatively large quantities of hydroxide ions are produced in this reactiorn complex. rate law for the reaction of arsenious acid withtriiodide Iodine reacts with starch to form a brown A purpose of this experiment is to determine the

Explanation / Answer

Iodine clock experiment

True : The rate of the reaction is determined by measuring the amount of time needed for all of the arsenious acid to be consumed by triiodide : arsenious acid is used as the reducing agent and until all of it is condumed we do not see a visible color change of the solution.

False : The solution must be buffered because relatively large quantities of hydroxide ions are produced in this reaction. Only H+ are produced and maintained by the buffer solution.

True : Iodine reacts with starch to form a brown complex. This is the end point as detected by the naked eyes in the experiment.

True : A purpose of this experiment is to determine the rate law for the reaction of arsenious acid with triiodide. This can also be determined by rate of disappearence of iodate in the reaction.

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