Uranyl hydroxide
Uranyl hydroxide is a hydroxide of uranium with the chemical formula UO(OH) in the monomeric form and (UO)(OH) in the dimeric; both forms may exist in normal aqueous media. Uranyl hydroxide hydrate is precipitated as a colloidal yellowcake from oxidized uranium liquors near neutral pH.
Hydron (chemistry)
The hydrated form of the hydrogen cation, the hydronium (hydroxonium) ion , is a key object of Arrhenius' definition of acid. Other hydrated forms, the Zundel cation which is formed from a proton and two water molecules, and . The hydron itself is crucial in more general Brønsted–Lowry acid–base theory, which extends the concept of acid–base chemistry beyond aqueous solutions.