What is the approximate pH value of pure water?
Answer and explanation
Correct answer: 7
Pure water is conventionally treated as neutral because it contains equal concentrations of hydrogen ions and hydroxide ions in equilibrium. At approximately 25°C, this gives a pH close to 7. A pH of 2 indicates a strongly acidic solution, while 10 indicates a basic solution and 14 represents a very strongly basic value on the common scale. Therefore option A, 7, is correct; the word approximate allows for temperature effects.
Frequently asked questions
What is the correct answer to this question?
7
Why is this the correct answer?
Pure water is conventionally treated as neutral because it contains equal concentrations of hydrogen ions and hydroxide ions in equilibrium. At approximately 25°C, this gives a pH close to 7. A pH of 2 indicates a strongly acidic solution, while 10 indicates a basic solution and 14 represents a very strongly basic value on the common scale. Therefore option A, 7, is correct; the word approximate allows for temperature effects.
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.
