If a base is slowly added to an acidic solution, what happens to the pH value?
Answer and explanation
Correct answer: It will increase
An acidic solution has a pH below 7. When a base is added, hydroxide ions react with hydrogen or hydronium ions, reducing the effective acidity. Consequently, the pH rises toward 7 at the neutralisation point and may become greater than 7 if excess base is added. It does not always remain zero or continually decrease. Thus option A is the correct general trend during gradual neutralisation.
Frequently asked questions
What is the correct answer to this question?
It will increase
Why is this the correct answer?
An acidic solution has a pH below 7. When a base is added, hydroxide ions react with hydrogen or hydronium ions, reducing the effective acidity. Consequently, the pH rises toward 7 at the neutralisation point and may become greater than 7 if excess base is added. It does not always remain zero or continually decrease. Thus option A is the correct general trend during gradual neutralisation.
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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