The cell potential for the given cell at 298 K

${}_{}{}^{}{}^{}$  $Pt|H_2\left(g,1bar\right)\left|H^{+}\left(aq\right)\right|\left|C{u}^{2+}\left(aq\right)\right|Cu\left(s\right)is0.31V.$ The pH of the acidic solution is found to be 3, whereas the concentration of Cu2+ is 10x M. The value of x is________.

(Given : $E_{C{u}^{2+}/Cu}^{\Theta }=0.34Vand\frac{2.303RT}{F}=0.06V)$ ${}_{{}^{}}^{}\frac{}{}$