If a solution has more hydroxide ions and fewer hydrogen ions, what colour may universal indicator show?
Answer and explanation
Correct answer: Blue or violet
The governing concept is the pH scale and the colour range of a universal indicator. An excess of hydroxide ions over hydrogen ions means the solution is basic and has a pH above 7. Universal indicator usually changes through green near neutral to blue and then violet as basicity increases. Red, orange, and yellow represent acidic ranges, so they do not fit the stated ion balance. The exact blue or violet shade depends on the pH.
Frequently asked questions
What is the correct answer to this question?
Blue or violet
Why is this the correct answer?
The governing concept is the pH scale and the colour range of a universal indicator. An excess of hydroxide ions over hydrogen ions means the solution is basic and has a pH above 7. Universal indicator usually changes through green near neutral to blue and then violet as basicity increases. Red, orange, and yellow represent acidic ranges, so they do not fit the stated ion balance. The exact blue or violet shade depends on the pH.
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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