General Science • ChemistryMedium
What happens to the pH of a dilute solution of sodium hydroxide when water is added to it?
A. pH increases
B. pH decreases towards seven✓ Correct Answer
C. pH remains completely unchanged
D. pH drops below seven immediately
💡 Solution & Explanation
Sodium hydroxide is a strong base with a high initial pH well above seven. Adding water dilutes the concentration of hydroxide ions per unit volume, which lowers the overall alkalinity and shifts the pH value closer to the neutral point of seven. Dilution never neutralizes a strong base completely into an acidic range unless an acid is added.
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