Why may an acid show little effect on an indicator if water is absent?
Answer and explanation
Correct answer: Because water is necessary for ion formation
The governing concept is that acids show their characteristic behaviour through hydrogen ions, more precisely hydronium ions in aqueous solution. Water allows the acid to ionise and permits the indicator molecules to respond with a colour change. A dry acid may therefore show little or no indicator effect. Indicators do not work only in metals, acids do not become bases without water, and dry acid still contains atoms.
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What is the correct answer to this question?
Because water is necessary for ion formation
Why is this the correct answer?
The governing concept is that acids show their characteristic behaviour through hydrogen ions, more precisely hydronium ions in aqueous solution. Water allows the acid to ionise and permits the indicator molecules to respond with a colour change. A dry acid may therefore show little or no indicator effect. Indicators do not work only in metals, acids do not become bases without water, and dry acid still contains atoms.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
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