Question

Which of the following is the cation that forms from water in the presence of hydrogen ions?

• A. Hydronium
• B. Hydroxyl
• C. Both (A) and (B)
  
• D. None of the above

Answer 1

Answer: (A)

Hydronium

Hydronium($H_3{O}^{+}$) is the cation that forms from water in the presence of hydrogen ions. These hydrons do not exist in a free state: they are extremely reactive and are solvated by water.