Hydrogen Ions and Hydroxide Ions Flashcards

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What ion do all acids release in aqueous (water) solution?

All acids release hydrogen ions, written as H⁺(aq), in aqueous solution.

What ion do all alkalis release in aqueous (water) solution?

All alkalis release hydroxide ions, written as OH⁻(aq), in aqueous solution.

In an acidic solution, which ion is there more of: H⁺ or OH⁻?

In an acidic solution there are more hydrogen ions, H⁺, than hydroxide ions, OH⁻.

In an alkaline solution, which ion is there more of: H⁺ or OH⁻?

In an alkaline solution there are more hydroxide ions, OH⁻, than hydrogen ions, H⁺.

How do the numbers of H⁺ and OH⁻ ions compare in a neutral solution like pure water?

In a neutral solution, the number of H⁺ ions equals the number of OH⁻ ions.

What does the state symbol (aq) mean in H⁺(aq) and OH⁻(aq)?

(aq) means the ion is dissolved in water, so it is in aqueous solution.

Why can acidic and alkaline solutions conduct electricity?

They can conduct electricity because they contain charged particles (ions) such as H⁺ and OH⁻ that can move.

Write the ionic equation for the neutralisation of an acid by an alkali.

H⁺(aq) + OH⁻(aq) → H₂O(l).

In terms of ions, what happens during neutralisation?

Hydrogen ions, H⁺, from the acid react with hydroxide ions, OH⁻, from the alkali to form water.

What is a hydrogen ion in simple terms?

A hydrogen ion is a hydrogen atom that has lost its electron, so it has a single positive charge (+1).