Copper Hydroxide
H2O and OH2 are not the same thing. H2O represents a water molecule composed of two hydrogen atoms and one oxygen atom. OH2 is not a valid chemical formula and does not represent any known compound.
Barium hydroxide (the formula is Ba(OH)2) contain two hydrogen atoms.
An alkyloxonium is an oxonium ion derived from an alkyl alcohol, of general formula R-OH2+.
Two hydroxide ions would best be written as 2 OH-1 in an ionic equation, rather than either of the alternatives given in the question. If the two hydroxide ions occur together with a divalent cation such as magnesium in a compound, then the hydroxide ions would be written as (OH)2. Two ions should never be written as OH2, because that is the formula for water, with the ions in an unconventional order, rather than the formula of ions at all.
The symbol OH2 typically refers to the hydroxide ion (OH-) combined with a hydrogen ion (H+), resulting in a hydronium ion (H3O+). This is commonly seen in acid-base reactions and represents a protonated form of water.
The chemical name of Ba(OH)₂ is barium hydroxide. It is an inorganic compound consisting of barium ions and hydroxide ions. Barium hydroxide is commonly used in various applications, including as a strong base in chemical reactions and in the manufacture of other barium compounds.
Mercury (I) Hydroxide Hg OH2 (2 is subscript) Mercury(II) Hydroxide Hg (OH)2
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The chemical compound OH3 does NOT exist. Water is OH2, and there is some OH3+ in any sample of water, this is due to the dissocation of water.
It has the elements of water within its formula. CH3CH2OH / H2O It is a very hygroscopic substance and readily forms 'hydrogen bonds' with water . CH3CH2OH----OH2 (Water drawn like this for clarity of hydrogen bonds. or OH2----OH(CH2)CH3 ( again drawn like this for clarity of hydrogen bonds).
as an antacid or a laxative