Water is neutral with ph 7. when we add water to acidic solution, it will be less acidic. so the pH of acid increases
I cant help unless there is an article..
Assuming that the solution is simply an aqueous solution
so that it is purely made of NaClO4 (the solute) and water (the solvent), then
I believe the dissolved species would only be the ions of NaClO4, these are:
Na+
ClO4 -