How do I calculate the concentration of Cu(NH3)42+?

Posted on 2017-03-16 18:37:00 in Chemistry by KEMBRA

1. How do I calculate the concentration of Cu(NH3)42+? I am only given that, in a test tube, there is 

3.00 mL of 0.05 M CuSO4 

mixed with 

7.00 mL of 0.20 M NH3/0.20M NH4NO3 

No DI water was added to this test tube. 

2. Once I have the concentration of Cu(NH3)42+, I understand how to do part 2 

3. I understand how to do part 3 

4. This is where I get stuck again, I don't know how to solve for this 

I am totally clueless on how to do 5-8 

Beer-Lambert Law: A = (el)*C

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