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Equilibrium Concentration of a Metal Ion in a Complex

CHEM-M4VAYZ

A solution is $2.2\times { 10 }^{ -3 }$ M in ${ Cu }^{ 2+ }$ and $0.33$ M in $NaCN$.

If the ${ K }_{ f }$ for ${ Cu(CN) }_{ 4 }^{ 2- }$ is $1.0\times 10^{ 25 }$, what is the concentration of copper ion at equilibrium?

A

$6.8\times { 10 }^{ -28 }M$

B

$2.1\times { 10 }^{ -26 }M$

C

$1.9\times { 10 }^{ -26 }M$

D

$6.7\times { 10 }^{ -27 }M$