Which statement is correct when an acidic solution is diluted with water?
Answer and explanation
Correct answer: Hydrogen ions per unit volume decrease and pH increases
Dilution increases the volume while the amount of dissolved acid remains the same. Consequently, the concentration of hydrogen ions, written as [H+], decreases. Since pH is related to concentration by pH = −log[H+], a decrease in [H+] produces an increase in pH. The solution becomes less acidic, but it does not necessarily become basic. Thus A is correct; B reverses the effect and C and D are false.
Frequently asked questions
What is the correct answer to this question?
Hydrogen ions per unit volume decrease and pH increases
Why is this the correct answer?
Dilution increases the volume while the amount of dissolved acid remains the same. Consequently, the concentration of hydrogen ions, written as [H+], decreases. Since pH is related to concentration by pH = −log[H+], a decrease in [H+] produces an increase in pH. The solution becomes less acidic, but it does not necessarily become basic. Thus A is correct; B reverses the effect and C and D are 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.
