Alkalis are bases that are dissolved in water. Which of the following is true?

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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

Alkalis are bases that are dissolved in water. Which of the following is true?

Explanation:
Alkalis are bases that dissolve in water and produce hydroxide ions, giving an alkaline solution. By that definition, the statement is true because the essence of an alkali is its solubility in water. When a soluble base like sodium hydroxide dissolves, it releases OH− ions, raising the pH and turning litmus blue. Bases that do not dissolve in water, such as many metal oxides, aren’t alkalis even though they are bases.

Alkalis are bases that dissolve in water and produce hydroxide ions, giving an alkaline solution. By that definition, the statement is true because the essence of an alkali is its solubility in water. When a soluble base like sodium hydroxide dissolves, it releases OH− ions, raising the pH and turning litmus blue. Bases that do not dissolve in water, such as many metal oxides, aren’t alkalis even though they are bases.

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