Posted by Anonymous on Sunday, May 6, 2012 at 9:15pm.
Here is how you do this with a little chicanery. First, we assume the reaction goes to completion to the right. That's not a bad assumption considering the size of the formation constant.
.........Co^2+ + 4NH3 ==> Co(NH3)4^2+
Initial.0.140....1.2........0
change...-0.140.-4*1.2.....0.140
equil.....0.......0.64......0.140
Actually, this isn't at equilibrium since we drove it to completion. Therefore, the numbers above are a little TOO far for equilibrium; therefore, it must move back to the left. How much will it move? We set up another set of conditions but start with where we ended above.
..........Co^2+ + 4NH3 ==> Co(NH3)4^2+
I.........0.......0.64......0.140
C.........+x......+4x.......-x
E.........x.....0.64+4x.....-x
Substitute into K.
K = [Co(NH3)4^2+]/[Co^2+][MH3]^4
5E31 = [0.140-x][x][0.64+4x]^4
Now assume 0.140-x = 0.140 and assume 0.64+4x = 0.64 and solve for x = (Co^2+). It's a very small number.
Related Questions
Chemistry - A 0.140-mole quantity of CoCl2 is added to a liter of 1.20 M NH3 ...
Chemistry - A 0.130-mole quantity of CoCl2 is added to a liter of 1.20 M NH3 ...
Chemistry - A 0.130-mole quantity of CoCl2 is added to a liter of 1.20 M NH3 ...
Chemistry - Suppose 49.6 mL of 0.242 M CoCl2 solution is added to 23.8 mL of 0....
Chemistry - 0.05 mole of HCL is added to a liter of buffer containing 0.04 mole ...
Chemistry - I have a test on monday and I NEED to ace it in order to raise my ...
Chemistry 114 - Write the balanced ionic equations for the following ...
Chemistry - If 3.5 mL of distilled water is added to 1.5 mL of 0.280 M CoCl2 ...
chemistry - If 3.5 ml of distilled water is added to 1.5 ml of a 0.150M solution...
chemistry - what are the symmetry elements for: cis-CoCl2(NH3)4 and trans-CoCl2(...
For Further Reading
