A 1 M Tris-HCl (pH 8.0) solution was diluted 10 fold. What will be the pH of the resulting solution?
A 1 M Tris-HCl (pH 8.0) solution was diluted 10 fold. What will be the pH of the resulting solution?
Select an option to attempt
Correct Answer: Option A
Explanation
Buffer pH and dilution:The Henderson-Hasselbalch equation:When a buffer is diluted:• Both the conjugate base [A−] and the weak acid [HA] are diluted by the SAME factor.• The RATIOremains UNCHANGED.• Therefore,remains unchanged.Practical limit: Extreme dilution (very high volume) will eventually reduce buffering capacity to near zero, but the pH changes only when buffering capacity is exhausted. A 10-fold dilution of a standard buffer keeps the pH essentially constant.For 1 M Tris-HCl (pH 8.0) diluted 10-fold → 0.1 M Tris-HCl: pH remains 8.0.Answer: pH = 8.0 (Option 1).