A solution gives orange colour with universal indicator and becomes yellow after adding more water. What is the correct conclusion?
Answer and explanation
Correct answer: The solution became less acidic but is still acidic
The governing concept is the indicator colour scale and dilution. Orange indicates an acidic solution, while yellow represents a less strongly acidic region on the universal-indicator scale. Adding water lowers the concentration of hydrogen ions, so the pH increases and the acidity decreases. However, a yellow colour does not prove that all acid has disappeared or that the solution has become basic. Ions remain present after dilution, so option A is correct.
Frequently asked questions
What is the correct answer to this question?
The solution became less acidic but is still acidic
Why is this the correct answer?
The governing concept is the indicator colour scale and dilution. Orange indicates an acidic solution, while yellow represents a less strongly acidic region on the universal-indicator scale. Adding water lowers the concentration of hydrogen ions, so the pH increases and the acidity decreases. However, a yellow colour does not prove that all acid has disappeared or that the solution has become basic. Ions remain present after dilution, so option A is correct.
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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