12 Questions
What is the ability of certain solutions to resist change in their pH upon addition of an acid or a base called?
Buffer action
What is the equation used to describe the relationship between a weak acid and its salt in a buffer solution?
Henderson-Hasselbalch equation
What is the measure of the efficiency of a buffer in resisting changes in pH?
All of the above
What is the maximum buffer capacity (β max) of a buffer solution containing a weak acid and its salt?
When the pH is equal to the pKa value of the weak acid
Why is it necessary to have a buffer system in some solutions?
Both a and b
What is the conventional way to express the buffer capacity (β) of a solution?
The amount of strong acid or base, in gram-equivalents, that must be added to 1 liter of the solution to change its pH by one unit
What is the primary purpose of buffering pharmaceutical solutions?
To maintain a constant pH when small amounts of acid or base are added
Which of the following is an example of an acidic buffer?
H2CO3 / NaHCO3
What is the mechanism of action of an acidic buffer when a strong base is added?
The hydroxyl ions from the strong base are removed by forming water molecules
Which of the following is an example of a basic buffer?
NH4OH / NH4Cl
What is the composition of a phosphate buffer?
A combination of monobasic potassium phosphate (KH2PO4) and dibasic potassium phosphate (K2HPO4)
What happens when a strong acid is added to an acidic buffer?
The hydrogen ions from the strong acid are removed by forming undissociated weak acid molecules
Test your knowledge on buffer solutions, buffer action, the Henderson-Hasselbalch equation, and buffer capacity. Learn about compounds that resist changes in pH and the efficiency of buffers in maintaining pH levels.
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