Have you tried the Nernst equation ?? You can estimate the potential by using that equation I once did electrodeposition of other metals by using that equation.

Nernst equation can be applied only if overpotential in the system is not contributing or it is significantly low. Hence deposition potential which includes equilibrium potential and over potential of the respective solution system has to be considered. I feel it may not be possible to calculate without experimental trial. Of course in aqueous solution if concentration of specific ion is extremely high and gas evolution is neglected it may be possible to estimate the figure neglecting contribution due to overpotential.

Thank you for all,

but when i say "without the electrodeposition process" it means that i need deposition without any electrodes and current...

Thanks to Jaroslav for good idea, i'll use it