In a solution, the oxidation state of silver can vary depending on the specific compound or complex it is present in. However, in most common cases, the oxidation state of silver in solution is +1. This means that the silver atom has lost one electron, resulting in a positive charge.

For example, in silver nitrate (AgNO3), which is a common silver salt, the silver ion has an oxidation state of +1. This is because the nitrate ion (NO3-) has a charge of -1, and the compound as a whole must be neutral. Therefore, the silver ion must have a positive charge to balance the negative charge of the nitrate ion.

Similarly, in silver sulfate (Ag2SO4), the silver ions also have an oxidation state of +1. In this case, each sulfate ion (SO42-) has a charge of -2, and since there are two silver ions for every sulfate ion, the silver ions must each have a charge of +1 to balance the overall charge of the compound.

It's worth noting that silver can also exhibit different oxidation states in certain compounds or complexes, such as +2 or even higher in some rare cases. However, the +1 oxidation state is the most common and widely encountered form of silver in solution.