Why does pH increase when hydroxide ions are added to an acidic solution?
Answer and explanation
Correct answer: Hydrogen ions convert into water
The governing concept is neutralisation and the definition of pH. An acidic solution contains an excess of hydrogen ions. Added hydroxide ions react with them according to H⁺ + OH⁻ → H₂O, decreasing the hydrogen-ion concentration. Since pH rises as hydrogen-ion concentration falls, option A correctly explains the increase. The other choices either describe the opposite trend or unrelated processes.
Frequently asked questions
What is the correct answer to this question?
Hydrogen ions convert into water
Why is this the correct answer?
The governing concept is neutralisation and the definition of pH. An acidic solution contains an excess of hydrogen ions. Added hydroxide ions react with them according to H⁺ + OH⁻ → H₂O, decreasing the hydrogen-ion concentration. Since pH rises as hydrogen-ion concentration falls, option A correctly explains the increase. The other choices either describe the opposite trend or unrelated processes.
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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