Do oxides react react with a weak acid like phosphoric acid?

[Rub3y]

TL;DR Summary

Do oxides react with phosphoric acid?

I have an ash which is a mix of oxides (Cr2O3, CuO, ZnO, PbO, CdO, NiO, SiO2, MgO, CaO). I am adding phosphoric acid. But as a weak acid, will it react with oxides? If so, are these conversions 100% or more of a equillibrium (partial conversion).

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[Borek]

This question is hardly different from the one you posted several days ago here. As you were told in the other thread there is no simple answer, and while you can probably find some pointers in the literature the only sure way (especially in the case of a specific mixture) is to check what happens experimentally.

I am locking the thread.