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April 20, 2014

Homework Help: Chemistry--help!

Posted by Val on Tuesday, March 9, 2010 at 11:24am.

Given the equilibrium:

HCN(aq) + H2O(l) ←→ H3O+(aq) + CN-(aq) ΔH >0; Ka = 4.0 x10-10

What happens to the concentration of hydrogen cyanide [HCN] when the following stresses are
placed on the system at equilibrium?

NaCl is added ---> Stays the Same but Why??
NaOH is added---> decreases, but why??
NaCN is added---> increases, but why doesn't it decrease? I thought it might add to CN^- ??
HCl is added---> increases, why does this make HCN increase while NaCl doesn't affect it??

I understood the other given stresses so I didn't list them, but I am pretty confused about why these answers are correct and not others...any help breaking this down is appreciated--thank you!!

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