This is the core challenge of the lab. Students must determine which reactant runs out first.
2Al(s)+3CuCl2(aq)→2AlCl3(aq)+3Cu(s)2 cap A l open paren s close paren plus 3 cap C u cap C l sub 2 open paren a q close paren right arrow 2 cap A l cap C l sub 3 open paren a q close paren plus 3 cap C u open paren s close paren Core Lab Objectives Left Over Aluminum Wire Lab
Using the mole ratio from the balanced equation ($2\text Al : 3\text CuCl_2$ or simplified to $1\text Al : 1.5\text CuCl_2$): leftover aluminum wire lab answer key
2 cap A l open paren s close paren plus 3 cap C u cap C l sub 2 open paren a q close paren right arrow 2 cap A l cap C l sub 3 open paren a q close paren plus 3 cap C u open paren s close paren 2. Key Observations and Indicators Color Change
A thorough answer key should also include how to judge the quality of the lab work. This is the core challenge of the lab
Most versions of this lab provide the following initial data (numbers may vary slightly by textbook or instructor). For this answer key, we will use a standard example:
If you actually got 2.10 g Cu: [ \frac2.102.36 \times 100 = 89% , \textyield ] Key Observations and Indicators Color Change A thorough
In your conclusion, state clearly:
: The solution starts as a distinct blue or green-blue due to cap C u raised to the 2 plus power