An antacid tablet contains sodium hydrogen carbonate, NaHCO 3 , and inert ingredients. A 0.465-g sample of powdered tablet was mixed with 53.3 mL of 0.190 M HCl (hydrochloric acid). The mixture was allowed to stand until it reacted. N a H C O 3 ( s ) + H C l ( a q ) → N a C l ( a q ) + H 2 O ( l ) + C O 2 ( g ) The excess hydrochloric acid was titrated with 54.6 mL of 0.128 M NaOH (sodium hydroxide). H C l ( a q ) + N a O H ( a q ) → N a C l ( a q ) + H 2 O ( l ) What is the percentage of sodium hydrogen carbonate in the antacid?
An antacid tablet contains sodium hydrogen carbonate, NaHCO 3 , and inert ingredients. A 0.465-g sample of powdered tablet was mixed with 53.3 mL of 0.190 M HCl (hydrochloric acid). The mixture was allowed to stand until it reacted. N a H C O 3 ( s ) + H C l ( a q ) → N a C l ( a q ) + H 2 O ( l ) + C O 2 ( g ) The excess hydrochloric acid was titrated with 54.6 mL of 0.128 M NaOH (sodium hydroxide). H C l ( a q ) + N a O H ( a q ) → N a C l ( a q ) + H 2 O ( l ) What is the percentage of sodium hydrogen carbonate in the antacid?
Solution Summary: The author explains that the mass percentage of Sodium hydrogen carbonate is 57%.
An antacid tablet contains sodium hydrogen carbonate, NaHCO3, and inert ingredients. A 0.465-g sample of powdered tablet was mixed with 53.3 mL of 0.190 M HCl (hydrochloric acid). The mixture was allowed to stand until it reacted.
N
a
H
C
O
3
(
s
)
+
H
C
l
(
a
q
)
→
N
a
C
l
(
a
q
)
+
H
2
O
(
l
)
+
C
O
2
(
g
)
The excess hydrochloric acid was titrated with 54.6 mL of 0.128 M NaOH (sodium hydroxide).
H
C
l
(
a
q
)
+
N
a
O
H
(
a
q
)
→
N
a
C
l
(
a
q
)
+
H
2
O
(
l
)
What is the percentage of sodium hydrogen carbonate in the antacid?
(11pts total) Consider the arrows pointing at three different carbon-carbon bonds in the
molecule depicted below.
Bond B
Bond A
Bond C
a. (2pts) Which bond between A-C is weakest? Which is strongest? Place answers in
appropriate boxes.
Weakest
Bond
Strongest
Bond
b. (4pts) Consider the relative stability of all cleavage products that form when bonds A,
B, AND C are homolytically cleaved/broken. Hint: cleavage products of bonds A, B,
and C are all carbon radicals.
i. Which ONE cleavage product is the most stable? A condensed or bond line
representation is fine.
ii. Which ONE cleavage product is the least stable? A condensed or bond line
representation is fine.
c. (5pts) Use principles discussed in lecture, supported by relevant structures, to
succinctly explain the why your part b (i) radical is more stable than your part b(ii)
radical. Written explanation can be no more than one-two succinct sentence(s)!
.
3°C
with
TH
12. (10pts total) Provide the major product for each reaction depicted below. If no reaction
occurs write NR. Assume heat dissipation is carefully controlled in the fluorine reaction.
3H
24 total (30)
24
21
2h
• 6H total
● 8H total
34
래
Br2
hv
major product
will be most
Substituted
12
hv
Br
NR
I too weak of a
participate in P-1
F₂
hv
Statistically
most favored
product will be
major
=
most subst =
thermo favored
hydrogen atom abstractor to
LL
F
Chapter 4 Solutions
OWLv2 with Student Solutions Manual eBook for Ebbing/Gammon's General Chemistry, 11th Edition, [Instant Access], 4 terms (24 months)
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Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell