Which ion is described as the acid ion in the material?

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Study for the IGCSE Edexcel Chemistry Test. Access flashcards and multiple choice questions with hints and explanations. Get ready for your exam!

Multiple Choice

Which ion is described as the acid ion in the material?

Explanation:
Acidity in aqueous solutions is defined by the presence of hydrogen ions. The ion that carries the acid character is the hydrogen ion, H+. In water this exists mainly as hydronium, H3O+, but the defining acid ion is H+. The hydroxide ion, OH−, is linked to bases. Sodium and chloride ions (Na+ and Cl−) come from salts and don’t determine whether a solution is acidic. So the hydrogen ion is the acid ion.

Acidity in aqueous solutions is defined by the presence of hydrogen ions. The ion that carries the acid character is the hydrogen ion, H+. In water this exists mainly as hydronium, H3O+, but the defining acid ion is H+. The hydroxide ion, OH−, is linked to bases. Sodium and chloride ions (Na+ and Cl−) come from salts and don’t determine whether a solution is acidic. So the hydrogen ion is the acid ion.

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