Calculate the moles of sodium hydroxide naoh used in

22. Calculate the moles of sodium hydroxide
(NaOH) used in each trial, and record the
results in Data Table 1
Moles = (Volume/1000)
∗
Concentration
23. Calculate the moles of sodium hydrogen
carbonate (NaHCO
3
) used in each trial, and
record the results in Data Table 1
Moles
NaHCO
3
= Moles
acetic acid
– Moles
NaOH
24. Calculate the neutralization capacity of each
trial, and record it in Data Table 1
8. Gently swirl the cup for several minutes until
all the pieces of the tablet are dissolved. The
solution will have a milky appearance.
9. After the tablet dissolves completely,
place the cup on the sheet of white
paper, and take a photograph of the solution.
Note: If the solution is yellow after the tablet
dissolves completely, insert “0 mL” in Data
Table 2 for “Volume of NaOH, total” and
proceed to S tep 18.
.
.
.
ACTIVITY 2
A Analysis of Tums
®
or Rolaids
®
1. Place the large plastic cup on the weigh
balance and tare the balance. Carefully weigh
5 g of acetic acid into the cup. Record the
exact mass of the acetic acid in the cup in
Data Table 2 (page 11).
2. Measure 20 mL of room temperature purified
water in the 50-mL graduated cylinder.
3. Add the 20 mL of purified water to the 5 g of
acetic acid in the large cup. Gently swirl the
cup to mix the solution.
4. Add 5–6 drops of Bogen Universal I ndicator
to the solution. Gently swirl the cup to mix the
solution.
5. Place the cup on the sheet of white
paper, and take a photograph of the
initial color of the solution.
6. Weigh one Tums
®
or Rolaids
®
tablet, and
record the mass in Data Table 2 .
7. Break the weighed tablet into smaller pieces
to help it dissolve, and add it to the solution in
the cup.
7
continued on next page

10. Transfer approximately 10 mL of 1 M sodium
hydroxide (NaOH) to the small medicine cup.
This solution will be used to fill the syringe.
11. Fill the 5-mL syringe with 1 M NaOH
solution. Minimize the amount of air in the
syringe by pointing the tip upward, gently
tapping the syringe, and slowly depressing
the plunger until the air is expelled. Be
careful not to spill NaOH onto your hands or
clothes during this procedure.
12. Record the initial volume of 1 M NaOH in the
syringe (to the nearest 0.1 mL) in Data
Table 2 .
13. Add NaOH from the syringe in 0.1-mL
increments. Gently swirl the cup between
each addition. Continue adding 0.1-mL
increments of 1 M NaOH until an orange
color persists for a few seconds after the
addition of the NaOH.
14. Add 1 M NaOH dropwise from the syringe,
with constant swirling, until a single drop of
NaOH causes the solution to change to a
yellow color that persists for a few seconds
after the addition. This indicates that the
endpoint of the titration has been reached
and the solution is at the equivalence point.