Why is the pH of pure water considered around seven?
Answer and explanation
Correct answer: Because acidic and basic effects are nearly equal
At about room temperature, pure water is considered neutral because it produces hydrogen ions and hydroxide ions in equal concentrations through self-ionisation. This balance gives a pH close to 7. Thus option A is correct. A strong acid would have a pH well below 7, and a strong base would have a pH well above 7; pure water is not simply a salt solution.
Frequently asked questions
What is the correct answer to this question?
Because acidic and basic effects are nearly equal
Why is this the correct answer?
At about room temperature, pure water is considered neutral because it produces hydrogen ions and hydroxide ions in equal concentrations through self-ionisation. This balance gives a pH close to 7. Thus option A is correct. A strong acid would have a pH well below 7, and a strong base would have a pH well above 7; pure water is not simply a salt solution.
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.
