so I'm stumped at this problem. I thought I'd give it a shot to all the Chem majors out there who could hopefully explain to me how in the world to attempt this problem correctly:

Consider the following equilibrium:

Cu^2+ + 4NH3 = Cu(NH3)4^2+ (Kf = 4.8e+12)

A solution is made by mixing 19.0 mL of 1.40 M CuSO4 and 1.30 L of 0.570 M NH3. Assume additive volumes to answer the following questions.

We are solving for the Concentrations of each of the products and reactants (ie: Cu2+, the NH3, and the Cu(NH3)4^2+

I'm completely stumped. this buffer solutions chapter has become the bane of my existence. Any help would be greatly appreciated.

11/11/2007 8:32:14 PM

Well you might start by switching to the chapter 8 "Equilibria Containing Metal Ions" because this isn't a buffer problem. =/

I don't prefer to answer chemistry problems that are straight from webassign here on this forum because my name is pretty obvious from my User ID and I don't want "help" to be judged as "cheating."

Why don't you use the cramster.com answer board for these types of questions. I assure you, you'll find a lot of folks willing to help with worked solutions and how-to explanations.

11/12/2007 12:00:00 AM

There is nothing in this problem that could not be addressed based on chapter five material. The only specifically distinctive feature here is that the copper-ammonia complex is soluble (an aqueous ion) and therefore does not have unit activity as do solids (the subject of the remainder of chapter 8) - unless, of course, its concentration were to be 1M.

11/12/2007 9:44:33 AM

^Is correct. I taught him everything I know.

11/12/2007 11:49:11 AM