Molarity of the HCl solution: Temperature (°C) Temperature (K) Final Buret Reading Initial Buret Reading mL of HCI Solution mmole HCI mmole tetraborate [B4O5(OH)42-] Trial 1 1.0M 22°C 295.15 K 2.2mL O ML Trial 2 39°C 312.15% K 3.7ml OML 3.7ml 2.2ML 2.2 mmole 3.7 mmole
Molarity of the HCl solution: Temperature (°C) Temperature (K) Final Buret Reading Initial Buret Reading mL of HCI Solution mmole HCI mmole tetraborate [B4O5(OH)42-] Trial 1 1.0M 22°C 295.15 K 2.2mL O ML Trial 2 39°C 312.15% K 3.7ml OML 3.7ml 2.2ML 2.2 mmole 3.7 mmole
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Question
how do you find mmole of tetraborate and [B4O5(OH)4^2-] for trial 1?
![Background:
Borax, or sodium tetraborate (Na2B4O5(OH)4), is used in many laundry products to aid in
the cleaning of clothes. There are even some commercial products that are exclusively
borax on the market which are sold as laundry aids. Borax is water soluble, but its
solubility varies markedly with temperature. At room temperature, borax is somewhat
soluble. We can write the solubility equilibrium and the solubility product constant for
borax as shown below.
10
vilgu 10
QUUiO?
ARGINE DE 300
Soms Jerutnb s
wensqaror or browar
Na2B4O5(OH)4(s) = 2Nat(aq) + B4O5(OH)4² (aq)
Jor Ksp = [Na+]²[B4O5(OH)4²]
seoda gninistros essed Jm 021's souff
If we have a solution that is saturated with borax, the concentration of the tetraborate
anion can be determined by titration with a solution of hydrochloric acid resulting in the
formation of boric acid. ish
Eton orit to virtploor arts broc
B4O5(OH)42 + 2H+ + 3H₂O → 4H3BO3
Each mole of the tetraborate ion requires two moles of hydrochloric acid to react
completely with it. If the concentration of the tetraborate ion is known, the concentration
of sodium ion is equal to two times the concentration of the tetraborate; assuming that
both ions in solution come only from the dissolution of borax. In this lab you will use the
titration with HCl to determine the Ksp values for borax over a series of different
temperatures. This data will then be used to determine different thermodynamic values
at 15kn svacinasup
for the dissolution reaction of borax.
sdr sau alesii
96 978 LOV ISTEM Dextrosb
AVER
02600
M.
We have learned several equations that can be used to calculate the Gibbs' Free Energy
cousig blos odi Trw Jasino di am00 2001uioz
(AG) for a reaction. naamilys botenbuste bloo od firw
left toyspinsho Im 02s motoni boras sc or abbon
AG=AH-TAS M. denyinsha um 025 N
ΟΙ ΔΗ
Stuntineup 21 sleeftsysanhid or otni zarod or lo
AG = -RT(InK)
10 vominottel odio 1918w besinoret dguons bb A
ovato) od's em ou
Jari ods
If we combine these two equations, we get:
AH – TAS = -RT(lnK).
sijo jo esibni seneto tvrtarão aqib bbA
This equation can be rearranged to give:bdayi Inioq surtolaviups ST JOH
or amb 100% no en 15ud gribue bus granule brone
AH-TAS
InK= = m
gniz
quotvorą sili
Hoy Sweet or lessi un 6-2 zqp12188qc 1 (e
-RT
eruar 2016togeista 18 noiuloa od bats unse
esfc frestur er usr olunteqoist a
80/2801
which rearranges further to give: jab sar no sieb woy lin biogsi goy na odev Jorg
AS woy 101 outav I sat stalinis) (0)
ΔΗ
or lnk= A+AS
R
1 to folos<
oriabron
Jugriebeng & Quo steb qoy to
The boxed form of the equation suggests that if we determine the values of Ksp for borax
14 moi.24 ba
over a series of temperatures and then make a plot of InK sp vs. we will get a straight
T'
lnk=
-AH AS
+
RT R
-ΔΗ
R
Vsat = 5,0 mL
line whose slope is
and whose intercept is
AS
R](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fd37e2ed8-d19a-4d84-a03c-203dab5c0742%2Fe382d33b-6071-4775-8415-3162e9beb0a7%2Fpyo14gp_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Background:
Borax, or sodium tetraborate (Na2B4O5(OH)4), is used in many laundry products to aid in
the cleaning of clothes. There are even some commercial products that are exclusively
borax on the market which are sold as laundry aids. Borax is water soluble, but its
solubility varies markedly with temperature. At room temperature, borax is somewhat
soluble. We can write the solubility equilibrium and the solubility product constant for
borax as shown below.
10
vilgu 10
QUUiO?
ARGINE DE 300
Soms Jerutnb s
wensqaror or browar
Na2B4O5(OH)4(s) = 2Nat(aq) + B4O5(OH)4² (aq)
Jor Ksp = [Na+]²[B4O5(OH)4²]
seoda gninistros essed Jm 021's souff
If we have a solution that is saturated with borax, the concentration of the tetraborate
anion can be determined by titration with a solution of hydrochloric acid resulting in the
formation of boric acid. ish
Eton orit to virtploor arts broc
B4O5(OH)42 + 2H+ + 3H₂O → 4H3BO3
Each mole of the tetraborate ion requires two moles of hydrochloric acid to react
completely with it. If the concentration of the tetraborate ion is known, the concentration
of sodium ion is equal to two times the concentration of the tetraborate; assuming that
both ions in solution come only from the dissolution of borax. In this lab you will use the
titration with HCl to determine the Ksp values for borax over a series of different
temperatures. This data will then be used to determine different thermodynamic values
at 15kn svacinasup
for the dissolution reaction of borax.
sdr sau alesii
96 978 LOV ISTEM Dextrosb
AVER
02600
M.
We have learned several equations that can be used to calculate the Gibbs' Free Energy
cousig blos odi Trw Jasino di am00 2001uioz
(AG) for a reaction. naamilys botenbuste bloo od firw
left toyspinsho Im 02s motoni boras sc or abbon
AG=AH-TAS M. denyinsha um 025 N
ΟΙ ΔΗ
Stuntineup 21 sleeftsysanhid or otni zarod or lo
AG = -RT(InK)
10 vominottel odio 1918w besinoret dguons bb A
ovato) od's em ou
Jari ods
If we combine these two equations, we get:
AH – TAS = -RT(lnK).
sijo jo esibni seneto tvrtarão aqib bbA
This equation can be rearranged to give:bdayi Inioq surtolaviups ST JOH
or amb 100% no en 15ud gribue bus granule brone
AH-TAS
InK= = m
gniz
quotvorą sili
Hoy Sweet or lessi un 6-2 zqp12188qc 1 (e
-RT
eruar 2016togeista 18 noiuloa od bats unse
esfc frestur er usr olunteqoist a
80/2801
which rearranges further to give: jab sar no sieb woy lin biogsi goy na odev Jorg
AS woy 101 outav I sat stalinis) (0)
ΔΗ
or lnk= A+AS
R
1 to folos<
oriabron
Jugriebeng & Quo steb qoy to
The boxed form of the equation suggests that if we determine the values of Ksp for borax
14 moi.24 ba
over a series of temperatures and then make a plot of InK sp vs. we will get a straight
T'
lnk=
-AH AS
+
RT R
-ΔΗ
R
Vsat = 5,0 mL
line whose slope is
and whose intercept is
AS
R
![Molarity of the HCl solution:
Temperature
(°C)
Temperature
(K)
Final Buret
Reading
Initial Buret
Reading
mL of HCI
Solution
mmole HCI
mmole
tetraborate
[B4O5(OH)42-]
Trial 1
1.0M
Trial 2
22°C
39°C
0
295.15 K 312.15%
2.2mL
3.7mL
0 ML
OmL
2.2mL
3.7ml
2.2 mmole 3.7 mmole](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fd37e2ed8-d19a-4d84-a03c-203dab5c0742%2Fe382d33b-6071-4775-8415-3162e9beb0a7%2Fd418hr4_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Molarity of the HCl solution:
Temperature
(°C)
Temperature
(K)
Final Buret
Reading
Initial Buret
Reading
mL of HCI
Solution
mmole HCI
mmole
tetraborate
[B4O5(OH)42-]
Trial 1
1.0M
Trial 2
22°C
39°C
0
295.15 K 312.15%
2.2mL
3.7mL
0 ML
OmL
2.2mL
3.7ml
2.2 mmole 3.7 mmole
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