Summary of Pre-Lab calculations for Experiment 11
This first page is just to clarify what you need to provide. Print two copies of the next page with your name and
answers. You will turn in one of the copies along with your pre-Lab calculations on your Lab notebook, and
you will use the second page to start your work while I check your pre-Lab.
I will double check that all your calculations are clearly written on your Lab Notebook.
Note: If you do not turn in you calculations and results, you will not be permitted to work on the experiment.
PART I
Concept Explained
pH Assigned (from the list)
Identity of your buffer: either Acetic
Acid/Acetate or
Ammonia/Ammonium
Molarity assigned for the most
concentrated ingredient (from the
list).
Identity of the most concentrated
ingredient in your buffer. This may
be the acid or base of your buffer,
depending on the pH assigned.
Volume to be used of Acetic Acid or
Ammonia solution (mL). Underline
your selection.
Mass of sodium acetate or
ammonium chloride salt required to
make the buffer (g). Underline your
selection.
If your buffer requires Acetic Acid,
we may use Glacial Acetic Acid,
which is considered pure acetic acid
with a molar mass of 60.0516 g/mol.
Give the mass of the Glacial Acetic
Acid required for the buffer (g).
PART II
Volume of 0.0010 M HCl or NaOH
(select one) required to prepare 100
mL of a solution with the same pH as
your buffer (mL).
PART IV
Volume of 1.0 M HCl required (mL)
to react with half of the conjugate
base present in 100 mL of your
buffer.
Final pH after the addition of the HCl
Reyes
Concept
pH Assigned
Identity of buffer
Molarity assigned
Most Concentrated
ingredient
V of Acetic
Acid/Ammonia (mL)
m (g) salt
m (g) glacial acetic acid
V (mL) HCl or NaOH
V HCl (mL)
Final pH
Value Calculated
Summary of Pre-Lab calculations for Experiment 11
Name:
Last
PART I
Concept
pH Assigned
Identity of buffer
Molarity assigned
Most Concentrated
ingredient
V of Acetic
Acid/Ammonia (mL)
m (g) salt
m (g) glacial acetic acid
(if needed)
PART II
V (mL) HCl or NaOH
PART IV
V HCl (mL)
Final pH
Reyes
First
Value Calculated