(i) Explain Kohlrausch's law. Write its applications.
Calculate the e.m.f. of the following cell: Cu(s)∣Cu2+(1M)∣∣Ag+(0.01M)∣Ag(s) \text{Cu(s)} | \text{Cu}^{2+} (1M) || \text{Ag}^{+} (0.01M) | \text{Ag(s)} Cu(s)∣Cu2+(1M)∣∣Ag+(0.01M)∣Ag(s) Given: ECu2+/Cu0=+0.34V,EAg+/Ag0=+0.80V E^0_{\text{Cu}^{2+}/\text{Cu}} = +0.34V, \quad E^0_{\text{Ag}^{+}/\text{Ag}} = +0.80V ECu2+/Cu0=+0.34V,EAg+/Ag0=+0.80V