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

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Phosphoric acid, being a weak acid, may react with various metal oxides present in the ash mixture, but the extent of these reactions is not guaranteed to be complete. The conversions are likely to be partial and influenced by equilibrium conditions rather than reaching 100% conversion. Experimental verification is essential to determine the specific reactions and outcomes for the unique mixture. Literature may provide some guidance, but practical testing is necessary for accurate results. The discussion emphasizes the complexity of predicting reactions in mixed oxide systems.
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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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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.

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