GRE Subject Test: Biochemistry, Cell, and Molecular Biology : Chemical Reactions
Study concepts, example questions & explanations for GRE Subject Test: Biochemistry, Cell, and Molecular Biology
All GRE Subject Test: Biochemistry, Cell, and Molecular Biology Resources
Example Questions
Example Question #4 : Help With Acid Base Chemistry And P H
A buffer can be created by adding equal amounts of weak acid and its conjugate base. What additional information is needed to determine the pKa of a buffer made in this manner?
pH
None of these are needed
Concentration of acid and conjugate base
Both of these are needed
pH
The buffer is made by using weak acid and its conjugate base. The relationship between the concentration of the components (acid and conjugate base), pKa, and pH can be determined by using the Henderson-Hasselbalch equation.
where 
Example Question #4 : Help With Acid Base Chemistry And P H
A researcher adds 
the same
half as much
three times as much
twice as much
the same
Hydrochloric acid (
Example Question #2 : Help With Acid Base Chemistry And P H
Solution A contains a weak acid and a weak base whereas solution B contains a weak acid and a strong base. What can you conclude about these two solutions?
I. Solution B will have a higher
II. Solution B will have a higher pOH
III. Solution A will have a lower concentration of hydroxide ions
I and II
None of these
II and III
III only
III only
Solution A has two weak reagents whereas solution B contains a strong base. This means that solution B will be more basic, will have a higher concentration of hydroxide ions, and a higher pH. 
This equation suggests that pOH decreases as the hydroxide ion concentration increases. Since it has the higher hydroxide ion concentration, solution B will have a lower pOH.
Example Question #93 : Gre Subject Test: Biochemistry, Cell, And Molecular Biology
What is the pH of a solution composed of 
Since this problem involves both the acid and the conjugate base of the acid, we can use the Henderson-Hasselbach equation in order to determine the pH of the solution:
Example Question #11 : Chemical Reactions
If a 
In order to determine what concentration of fluoride is needed, we can use the Henderson-Hasselbach equation:
Certified Tutor
All GRE Subject Test: Biochemistry, Cell, and Molecular Biology Resources
