Medium Practice — Set 2

Quick Recap — Conductance, Batteries & Corrosion

• Strong electrolyte: $\Lambda_m$ rises slightly on dilution; weak electrolyte: rises steeply. Degree of dissociation $\alpha=\dfrac{\Lambda_m}{\Lambda^\circ_m}$.
• $E^\circ_{cell}>0\Rightarrow K>1$; the Nernst factor 0.059 applies at 298 K.
• Electrolysis: molten $NaCl\to$ Na + $Cl_2$; aqueous $NaCl\to H_2$ (cathode) + $Cl_2$ (anode).
• Corrosion protection: galvanising, and sacrificial anodes (a more reactive metal like Zn/Mg).