Hydronium ion is a water molecule with an extra hydrogen ion attached to it. ( H2O + H+ → H3O+). It usually used to determine the acidity of a chemical compound. When a compound is put into water solution, the more the hydronium ion is produced, the higher the acidity is.
http://www.answers.com/Q/What_is_a_hydronium_ion
Hydronium ion, H3O+, is what gives a low pH to an aqueous solution. Hydronium ion is made when an acid donates a hydrogen ion to a water molecule.    Hydroxide ion, OH-…, gives a higher pH to an aqueous solution. Hydroxide ions are found in bases; a base donates hydroxide ions to water.    Combining H3O+ + OH- makes 2 H2O.
http://www.answers.com/Q/What_is_a_hydronium_ion
In the article on pH, the pH is defined to be the logarithm of a dimensionless constant, the activity of hydronium, but in this article, it is asserted that a pH of 7 corresponds to a negative logarithm of ten to the minus seventh moles per liter.
https://en.wikipedia.org/wiki/Talk:Hydronium
Eigen placed the hydronium ion at the centre of an H9O4+ complex in which the hydronium is strongly hydrogen-bonded to 3 neighbouring water molecules (3). Eigen proposed an H5O2+ complex, in which the proton is shared equally by two water molecules (4).
https://en.wikipedia.org/wiki/Talk:Hydronium
What is the hydronium ion concentration in a solution where the hydroxide ionconcentration is 1 x 10-9 M? 3O+] and is the unknown quantity. The hydroxide ion concentration is represented by [OH-] and is 1 x 10-9 M. So the final hydronium ion concentration is 1 x 10 -5M. Comparison of 1 x 10 M versus 1 x 10-9 M. 3O+] > [OH-] so the solution is acidic.
http://www.bmcc.cuny.edu/faq/faq_upload/hydroniumIon.pdf
Talk:Hydronium. WikiProject Chemistry. This article is within the scope of WikiProject Chemistry, a collaborative effort to improve the coverage of chemistry on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.
https://en.wikipedia.org/wiki/Talk:Hydronium
The pKa given for the hydronium ion is meaningless. The Ka for hydronium is the equilibrium constant for the reaction H3O+ + H2O <-> H2O + H3O+. This is a null reaction (products are the same as the reactants), so the equilibrium constant is, by definition, one.
https://en.wikipedia.org/wiki/Talk:Hydronium
Metal sorption starts when the pH rises to the range where most acidic ion exchange sites start to exchange hydronium ion for metal and the capacity reaches the maximum value in the pH range where all the ion exchange sites take part in the reaction and the functional group is able to form complex with the metal cations (37).
http://www.thefreedictionary.com/Hydronium+ion
Activated Carbon Surface + Monochloramine + Water [right arrow] Ammonia + Hydronium Ion + Chloride Ion + Oxidized Site on the Activated Carbon Surface. Compendial water system design, operation, and maintenance: case histories on how municipal water treatment techniques can affect your pure water system. The hydroxide ion also forms more-complicated intermediate structures in water than the hydronium ion does.
http://www.thefreedictionary.com/Hydronium+ion
Hydronium ion is a water molecule with an extra hydrogen ion attached to it. ( H2O + H+ → H3O+). It usually used to determine the acidity of a chemical compound.   <br/>When a compound is put into water solution, the more the hydronium ion is produced, the higher the acidity is.
http://www.answers.com/Q/What_is_a_hydronium_ion
what is an hydronium ion
Hydronium ion is a water molecule with an extra hydrogen ion attached to it.