If the pH value decreases from 7 to 3, what change occurs in the nature of the solution?
Answer and explanation
Correct answer: The solution becomes more acidic
On the pH scale, 7 represents neutrality, values below 7 indicate acidity, and values above 7 indicate basicity. A fall from pH 7 to pH 3 therefore changes the solution from neutral to acidic. Because pH is logarithmic, pH 3 also represents a much greater hydrogen-ion concentration than pH 7. Hence option A is correct; the other choices reverse or deny the pH relationship.
Frequently asked questions
What is the correct answer to this question?
The solution becomes more acidic
Why is this the correct answer?
On the pH scale, 7 represents neutrality, values below 7 indicate acidity, and values above 7 indicate basicity. A fall from pH 7 to pH 3 therefore changes the solution from neutral to acidic. Because pH is logarithmic, pH 3 also represents a much greater hydrogen-ion concentration than pH 7. Hence option A is correct; the other choices reverse or deny the pH relationship.
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.
