The standard emf for the cell reaction $\mathrm{Zn}+{\mathrm{Cu}}^{2+}\to {\mathrm{Zn}}^{2+}+\mathrm{Cu}$ is 1.10 volt at ${25}^{\mathrm{o}}\mathrm{C}$. The emf for the cell reaction when 0.1 M ${\mathrm{Cu}}^{2+}$ and 0.1 M ${\mathrm{Zn}}^{2+}$ solutions are used at ${25}^{\mathrm{o}}\mathrm{C}$ is