Which ion is produced by alkalis in solution?

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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 produced by alkalis in solution?

Explanation:
When alkalis dissolve in water, they release hydroxide ions. This is what makes the solution alkaline: the presence of OH− increases the pH. For example, sodium hydroxide dissociates into Na+ and OH−. The ion that characterizes an alkali in solution is the hydroxide ion, OH−, not H+, which comes from acids, nor the spectator cations Na+ or K+. So the hydroxide ion is the produced species in solution by alkalis.

When alkalis dissolve in water, they release hydroxide ions. This is what makes the solution alkaline: the presence of OH− increases the pH. For example, sodium hydroxide dissociates into Na+ and OH−. The ion that characterizes an alkali in solution is the hydroxide ion, OH−, not H+, which comes from acids, nor the spectator cations Na+ or K+. So the hydroxide ion is the produced species in solution by alkalis.

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