If a base is slowly added to an acidic solution, what generally happens to its pH?
Answer and explanation
Correct answer: pH will increase
An acidic solution has a pH below 7 because it contains a relatively high concentration of hydrogen ions. A base reacts with and neutralises some of this acidity. As base is added gradually, the hydrogen-ion concentration generally falls, so the pH rises toward 7. It may rise above 7 if excess base is added. Therefore, option A is correct; option B gives the opposite trend, while C and D are scientifically incorrect.
Frequently asked questions
What is the correct answer to this question?
pH will increase
Why is this the correct answer?
An acidic solution has a pH below 7 because it contains a relatively high concentration of hydrogen ions. A base reacts with and neutralises some of this acidity. As base is added gradually, the hydrogen-ion concentration generally falls, so the pH rises toward 7. It may rise above 7 if excess base is added. Therefore, option A is correct; option B gives the opposite trend, while C and D are scientifically incorrect.
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.
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