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consider the following observations: an unknown quantity of zinc was mixed with an unknown quantity of...

consider the following observations: an unknown quantity of zinc was mixed with an unknown quantity of iodine in a test tube. water and acetic acid were added and the contents of the tube were shaken for 20 minutes. after this time the solution in the tube was brown. agitating the tube for an additional 10 minutes produces no lightening of the color of the solution. what is the limiting reactant in the reaction? what reagent is present in excess? explain
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Zn2+(aq) + I2(aq) ------> ZnI2(aq) + I2 -------> [ZnI4]2- . The formation of the ZnI2 from Zn and I2 solution indicates a change in colour of I2 from violet to brown after about 20 mins. After 10 mins, there is no further change in the colour of the brown solution. The limiting reagent is I2, which acts as an oxidising agent and Zn is in excess, which is the reducing agent.Whatever I2 is available, it is completely reduced from iodine to iodide by Zn, so Zn is in excess.

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