All the Lewis acids accept hydrogen ion or proton from any othercompound having acidic hydrogen.
Hydronium Ion
A compound that accepts hydrogen ions (which are always positive) is a Lewis Base. A compound that lets go of a hydrogen ion is a Lewis Acid.
The Svante Arrhenius definition of an acid is a compound that donates a hydrogen ion (or proton) in an aqueous solution.
An acid is a proton (hydrogen ion) donor.A substance or compound that gives up or transfers a hydrogen atom to another substance is know as an hydrogen-ion donor. Hydroxide ions are still bases - they accept hydrogen ions from acids and form water
A conjugant acid.
If it produces a hydrogen ion in solution it is referred to as an ACID.
covalently bonding it to another hydrogen ion
Conjugate acid
Water is a compound. Hydrogen and oxygen agreements and the chloride ion, being an ion, is not a substance in its own right.
hydrogen phosphate ion.
Hydroxide.
An acid for example.