If the pH of a solution increases from 3 to 6, what happens to its acidic nature?
Answer and explanation
Correct answer: Acidity decreases
The pH scale expresses hydrogen-ion concentration on a logarithmic scale. Values below 7 indicate acidity, and a higher pH means a lower hydrogen-ion concentration and therefore weaker acidity. A rise from pH 3 to pH 6 represents a 1000-fold decrease in hydrogen-ion concentration, although the solution remains acidic because 6 is still below 7. Thus option A is correct, while option C is false.
Frequently asked questions
What is the correct answer to this question?
Acidity decreases
Why is this the correct answer?
The pH scale expresses hydrogen-ion concentration on a logarithmic scale. Values below 7 indicate acidity, and a higher pH means a lower hydrogen-ion concentration and therefore weaker acidity. A rise from pH 3 to pH 6 represents a 1000-fold decrease in hydrogen-ion concentration, although the solution remains acidic because 6 is still below 7. Thus option A is correct, while option C is false.
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.
