Help on #56 of Gen Chem Sample Test

[nc2tarheels]

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https://www.ada.org/oat/oat_sample_test.pdf

I got it right, but reviewing it, I'm unsure of why. I feel pretty strong with the Gen Chem section, however solubility is my weak link. Any help is appreciated!

 

[BandanaGuy]

https://www.ada.org/oat/oat_sample_test.pdf

I got it right, but reviewing it, I'm unsure of why. I feel pretty strong with the Gen Chem section, however solubility is my weak link. Any help is appreciated!

Remember that Kc, K, or the equilibrium constant is the concentration of the products, divided by the concentration of the starting material.

K= [Ag(NH3)2]*[Cl-]/ [AgCl]*[NH3]^2

The problem states that K= 4x10^-3, since the value is less than 1, the reactants are favored, suggesting that the compound is not extremely soluble in NH3.

Now remember, that Ksp is the solubility constant of a compound in water. Ksp is essentially the same as a Kc. The value here is 1 x 10^-10. This value is even smaller than the K value for NH3. This means that AgCl is more soluble in NH3 than water, while still being relatively insoluble in both.

Hope this helps. 🙂 Good luck with your studies.

 

[nc2tarheels]

Wow, I appreciate it. I feel real dumb now. LOL, you made it seem simple.