AL2O3 + ? →AL2(SO4)3... AL(OH)3→AL2O3 P2O5+?→K3PO4... P2O5+?→H3PO4... H3PO4+?→Na3PO4... ЧТО НУЖНО ДОБАВИТЬ? ПОЖАЛУЙСТА,ОЧЕНЬ СРОЧНО)
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