Need help A student determining the empirical formula of copper chloride using t

Question

   Need help

A student determining the empirical formula of copper chloride using the procedure in this experiment, had some problems with technique. plain the effect each of the following had on the experimentally determined percent Cu and percent Cl in Cu_x Cl_y- When the student dropped the piece of Zn into the copper chloride solution, some of the solution splashed onto the laboratory bench. The student removed the piece of zn from the reaction mixture before the blue color had completely disappeared from the solution. Some solid Cu was still adhering to the Zn when the student removed, dried, and weighed the Zn after the reaction was complete. The student had not completely dried the Cu before the final weighing

Explanation / Answer

1) The experimental determined values of Cu and Cl will be lower than the actual ones.
2) If Zn was removed before the blue color had disappeared, then that indicates that not
   all Cu is consumed during the reaction. So, you will end up getting a lower value
   of Cu.
3) If it is stuck to the walls then the weight of Cu will be less than the original and the
concentration of Cu gets reduced. Cu percent will get reduced and it does not
   influence Cl.
4) To get correct weight it should be dried completely, otherwise you will have hydrated Cu weight.
   The weight of Cu will be more and therefore Cu percent will be more it will not effect Cl.
  

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