If an unknown solution turns red litmus blue and has pH eleven, what is the most correct conclusion?
Answer and explanation
Correct answer: The solution is basic
The governing concept is the identification of acids and bases using indicators and pH. A basic solution changes red litmus to blue, while a pH greater than 7 indicates alkalinity; pH 11 is therefore basic. Both independent observations support option A. An acidic solution has pH below 7 and generally turns blue litmus red, a neutral solution has pH about 7, and an ion-containing solution is not ion-free.
Frequently asked questions
What is the correct answer to this question?
The solution is basic
Why is this the correct answer?
The governing concept is the identification of acids and bases using indicators and pH. A basic solution changes red litmus to blue, while a pH greater than 7 indicates alkalinity; pH 11 is therefore basic. Both independent observations support option A. An acidic solution has pH below 7 and generally turns blue litmus red, a neutral solution has pH about 7, and an ion-containing solution is not ion-free.
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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