Question

For the reaction $Cu\left(s\right)+2A{g}^{+}\left(aq\right)\leftrightharpoons C{u}^{2+}\left(aq\right)+2Ag\left(s\right),$ the equilibrium constant is given by:

• A. $\frac{{\left[C{u}^{2+}\right]}^2{\left[Ag\right]}^2}{\left[Cu\right]{\left[A{g}^{+}\right]}^2}$
• B. $\frac{\left[C{u}^{2+}\right]{\left[Ag\right]}^2}{\left[Cu\right]{\left[A{g}^{+}\right]}^2}$
• C. $\frac{\left[C{u}^{2+}\right]}{{\left[A{g}^{+}\right]}^2}$
• D. $\frac{{\left[A{g}^{+}\right]}^2}{\left[C{u}^{2+}\right]}$

Answer 1

The correct option is C $\frac{\left[C{u}^{2+}\right]}{{\left[A{g}^{+}\right]}^2}$

The equilibrium constant of the reaction $Cu\left(s\right)+2A{g}^{+}\left(aq\right)\leftrightharpoons C{u}^{2+}\left(aq\right)+2Ag\left(s\right)$ is $K_c=\frac{\left[C{u}^{2+}\right]{\left[Ag\right]}^2}{\left[Cu\right]{\left[A{g}^{+}\right]}^2}$.

In the expression for the equilibrium constant, the concentration of solid substances are considered as a unity.

Hence, the expression for the equilibrium constant becomes $K_c=\frac{\left[C{u}^{2+}\right]}{{\left[A{g}^{+}\right]}^2}$.