Can a solution contain only cations?

[abcd8989]

For example, can Cu2+ be the only ionic species present in an aqeuous solution, without anions such as nitrate. (Hydroxide ions ignored)

 

[Borek]

No, solutions are always electrically neutral.

That is, it is possible for a small drop to have a small charge, but nothing close to bulk solution containing only cations or only anions. Just like any charged object it will discharge at first occasion.

 

[lightarrow]

For example, can Cu2+ be the only ionic species present in an aqeuous solution, without anions such as nitrate. (Hydroxide ions ignored)

In case you succedeed to make it, I would strongly advise you to stay many metres apart