Equal volumes of acid and base are mixed, yet the solution remains acidic. What is the most suitable reason?
Answer and explanation
Correct answer: The acid was more concentrated or stronger
Neutralisation depends on the amounts of reacting hydrogen and hydroxide ions, not merely on the volumes of the two solutions. Equal volumes can contain very different numbers of particles when their concentrations differ; their acids or bases may also differ in strength. If the acid supplies a greater effective amount of hydrogen ions than the base can neutralise, some acidity remains and the final pH stays below 7. Thus A is correct. Equal volume does not guarantee neutrality, and salt formation does not produce hydrogen gas here.
Frequently asked questions
What is the correct answer to this question?
The acid was more concentrated or stronger
Why is this the correct answer?
Neutralisation depends on the amounts of reacting hydrogen and hydroxide ions, not merely on the volumes of the two solutions. Equal volumes can contain very different numbers of particles when their concentrations differ; their acids or bases may also differ in strength. If the acid supplies a greater effective amount of hydrogen ions than the base can neutralise, some acidity remains and the final pH stays below 7. Thus A is correct. Equal volume does not guarantee neutrality, and salt formation does not produce hydrogen gas here.
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.
