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

Explanation:
Alkalis create alkaline solutions by increasing the amount of hydroxide ions in water. The ion that directly brings this basic character is the hydroxide ion, OH-. If you think of a base like NaOH, it dissolves to give Na+ and OH-, and the presence of OH- raises the pH. In contrast, H+ would make the solution acidic, Na+ is just a metal cation accompanying the base, and Cl- is a halide with no basicity. So the alkali ion described is hydroxide, OH-.

Alkalis create alkaline solutions by increasing the amount of hydroxide ions in water. The ion that directly brings this basic character is the hydroxide ion, OH-. If you think of a base like NaOH, it dissolves to give Na+ and OH-, and the presence of OH- raises the pH. In contrast, H+ would make the solution acidic, Na+ is just a metal cation accompanying the base, and Cl- is a halide with no basicity. So the alkali ion described is hydroxide, OH-.

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