Question

Molecule of water combines with a ........... . (Hydrogen atom/proton/hydrogen molecule) to form hydronium ion. ​

Answer 1

Explanation:

Proton or H+ ion

...........

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Answer 2

Molecule of water combines with a proton H+ to form hydronium ion.

Explanation:  

• The Hydronium ions to form when a water molecule reacts with the proton H+.

• When an acid reacts with water, the hydronium ion is always formed. The acid's H+ always attaches to another water molecule, producing H3O+.

• Another viewpoint on the hydronium ion is from the viewpoint of the proton (H+).

• Hydration is the method of adding water to something.
• The amount of hydronium ions is denoted by the symbol [H+]. This metric indicates as basic a solution .

• The symbol for hydroxide ion concentration is [OH-].