CAIE IGCSE Chemistry Hydrogen and Hydroxide Ions in Solution

Practise identifying hydrogen ions as responsible for acidity and hydroxide ions as responsible for alkalinity in aqueous solutions.

Exam points

identify hydrogen ions, H⁺, as the species responsible for acidity in aqueous solution
identify hydroxide ions, OH⁻, as the species responsible for alkalinity in aqueous solution

[Maximum number: 1]

The table shows the numbers of protons, neutrons and electrons in particles A to I.

Answer the following questions about particles A to I. Each letter may be used once, more than once or not at all.

State which of the particles A to I:

causes acidity in aqueous solutions

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