Ncert Exercises & Solutions

Write the Nernst equation for the cell reaction in the Daniel cell. How will the E_cell . be affected when concentration of Zn²⁺ ions is increased?

\underline{Z} n + {Cu}^{2 +} ⟶ {Zn}^{2 +} + Cu

\begin{array}{l} E_{cell} = E_{cell} ° - \frac{0.0591}{2} \log [\frac{Z n^{2 +}}{C u^{2 +}}] \\ E_{cell} ° = E_{cell} ° + \frac{0.0591}{2} \log [\frac{{Cu}^{2 +}}{{Zn}^{2 +}}] \end{array}

According to this equation

E⁰_cell iS directly dependent on concentration of Cu²⁺ and inversely depends upon concentration of Zn²⁺ ions.

E_cell decreases when concentration of Zn²⁺ ions is increased.