If acid is added to a basic solution, in which direction will its pH generally move?
Answer and explanation
Correct answer: It will decrease
A basic solution normally has a pH greater than 7 because its hydroxide-ion concentration is relatively high. When acid is added, hydrogen ions react with hydroxide ions and reduce the solution’s basicity. Consequently, the pH generally decreases, first moving toward 7; with enough acid it can become less than 7. Thus option A is correct. The other options either reverse the trend or make unsupported absolute claims.
Frequently asked questions
What is the correct answer to this question?
It will decrease
Why is this the correct answer?
A basic solution normally has a pH greater than 7 because its hydroxide-ion concentration is relatively high. When acid is added, hydrogen ions react with hydroxide ions and reduce the solution’s basicity. Consequently, the pH generally decreases, first moving toward 7; with enough acid it can become less than 7. Thus option A is correct. The other options either reverse the trend or make unsupported absolute claims.
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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