#2 of 5 hotels in Chenonceaux. â 1  Best romantic chateau of the Loire Valley 2  â. Roseraie hotel is really close to the Chateau. 3  November 27, 2016.
A hydronium ion is formed when a positively charged hydrogen ion bonds with a molecule of water through a coordinate covalent bond. In this coordinate covalent bond, the oxygen from the water... A hydronium ion is formed when a positively charged hydrogen ion bonds with a molecule of water through a coordinate covalent bond.
pH Scale. Hydrogen ions don't actually float around independently; whenever they're in water, hydrogen ions quickly combine with H2O to form hydronium ions, which have the formula H3O+. Hydrogen ion concentration, then, is really hydronium ion concentration; chemists use the two terms almost interchangeably.