(a) Yes, all basic solutions have H⁺ ions. They are basic because the concentration of hydrogen ions is much less than that of hydroxide ions.

Are hydronium ions acidic or basic?

For simplicity, hydronium ions are referred to as hydrogen ions H⁺. In pure water, there are an equal number of hydrogen ions and hydroxide ions. The solution is neither acidic or basic.

Do bases produce hydronium ions?

In water solutions, acids affect water molecules, producing hydronium (H₃O⁺) and bases also affect water molecules, producing hydroxide (OH^-) ions.