If hydrogen ions are much more numerous than hydroxide ions in a solution, which colour is more likely with universal indicator?
Answer and explanation
Correct answer: Red or orange
When hydrogen-ion concentration is much greater than hydroxide-ion concentration, the solution is acidic and its pH is below 7. Universal indicator shows red at very low pH and orange in a moderately strong acidic range, so red or orange is the most likely colour. Blue and violet indicate alkaline conditions, while green is near neutral. The indicator is not necessarily colourless. Therefore A is correct.
Frequently asked questions
What is the correct answer to this question?
Red or orange
Why is this the correct answer?
When hydrogen-ion concentration is much greater than hydroxide-ion concentration, the solution is acidic and its pH is below 7. Universal indicator shows red at very low pH and orange in a moderately strong acidic range, so red or orange is the most likely colour. Blue and violet indicate alkaline conditions, while green is near neutral. The indicator is not necessarily colourless. Therefore 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.
Student feedback
Was this question useful?
👍 0 Helpful 👎 0 Not helpful
Yes 0% No 0%
0 responsesStudent Reviews
No published reviews yet.
