Homovalent oxides ntawm cov hlau tsis muaj hlau hauv cov kua qaub hauv cov kua qaub yog cov anhydrides ntawm oxygenacids. Piv txwv, yog tias lub valence ntawm carbon hauv carbonic acid yog +4, tom qab ntawd nws cov anhydride yog carbon dioxide.
Organic acids tuaj yeem siv los tshem tawm dej, uas yog ntxiv cov naj npawb stoichiometric nyob rau hauv pem hauv ntej ntawm cov kua qaub kom phim cov hydrogen ion mus rau tus naj npawb txawm (tus lej txawm tias tus lej tsis tsim nyog) thiab tom qab ntawd tshem ib lossis ob peb H2O. Piv txwv li: CH3COOH (cov lej yog cov ntawv sau, tib qho hauv qab) muaj tsuas yog 1 hydrogen ion nyob rau pem hauv ntej ntawm stoichiometric naj npawb 2, thiab tom qab ntawd tshem tawm ib qho H2O, qhov tau txais (CH3CO) 2O yog nws cov kua qaub ua dej cawv; qhov qub, yog tias muaj Rau 3 hydrogen ions, ntxiv tus naj npawb stoichiometric ntawm 2, thiab tom qab ntawd tshem 3 dej.
Alumina yog tsim los ntawm lub cev qhuav dej ntawm Al (OH) 3, vim tias txhuas hydroxide tuaj yeem sau ua HAlO2 · H2O (metaluminate), thiab lub cev qhuav dej yog alumina {2HAlO2 · H2O=Al2O3 · 2H2O (lub cev qhuav dej) → Al2O3}.