QUESTIOΝ1 a) Calculate ionic strength (Im) and mean activity coefficient (Y+) for a 0.050 m solution of Ca(NO3)2 at 298 K. Given that: A = 0.509 for aqueous solution at 25 °C. [y+ 0.403] b) The molar conductivity (A) of 0.0250 M HCOOH (aq) was measured at 4.61 mS m? mol-1. By referring to Table 1, calculate i) molar conductivity of infinite dilution (A.) of HCOOH (aq) (in unit ms m? mol4) [40.42 ms m? mol1] ii) degree of dissociation (a) of HCOOH (aq) [0.114] iii) acidity constant (Ka) [3.67x104] iv) pka [3.44] (hint: HA (aq) + H2O (I) = H30* (aq) + A (aq), Ka = аНА c) Calculate the solubility (s) of BaSO4 (Ksp = 1.08×1010) %3D i) in pure H20 [1.04×10$]
QUESTIOΝ1 a) Calculate ionic strength (Im) and mean activity coefficient (Y+) for a 0.050 m solution of Ca(NO3)2 at 298 K. Given that: A = 0.509 for aqueous solution at 25 °C. [y+ 0.403] b) The molar conductivity (A) of 0.0250 M HCOOH (aq) was measured at 4.61 mS m? mol-1. By referring to Table 1, calculate i) molar conductivity of infinite dilution (A.) of HCOOH (aq) (in unit ms m? mol4) [40.42 ms m? mol1] ii) degree of dissociation (a) of HCOOH (aq) [0.114] iii) acidity constant (Ka) [3.67x104] iv) pka [3.44] (hint: HA (aq) + H2O (I) = H30* (aq) + A (aq), Ka = аНА c) Calculate the solubility (s) of BaSO4 (Ksp = 1.08×1010) %3D i) in pure H20 [1.04×10$]
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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![ii) in an aqueous solution with ionic strengths (Im) = 0.00010 mol kg1. Given that: A =
0.509 for aqueous solution at 25 °C. [1.09×10³]
(hint: MX = M* + X', Ksp = (am+)(ax-), Ksp denotes solubility product)
Table 1 Limiting ionic conductivities (Ao) in water at 298 K
Cations
do (mS m² mol)
Anions
do (mS m? mol4)
H+
34.96
OH
19.91
K+
7.35
co}
13.86
Lit
3.87
HCO,
5.46
NH4*
7.35
CH3CO,
4.09
H+
34.96
OH
19.91](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F93fb09af-4b0b-4914-96b4-4a1ebb2e50e6%2F7934bf5c-a837-469e-9e10-c4861527736c%2F0np1fjh_processed.jpeg&w=3840&q=75)
Transcribed Image Text:ii) in an aqueous solution with ionic strengths (Im) = 0.00010 mol kg1. Given that: A =
0.509 for aqueous solution at 25 °C. [1.09×10³]
(hint: MX = M* + X', Ksp = (am+)(ax-), Ksp denotes solubility product)
Table 1 Limiting ionic conductivities (Ao) in water at 298 K
Cations
do (mS m² mol)
Anions
do (mS m? mol4)
H+
34.96
OH
19.91
K+
7.35
co}
13.86
Lit
3.87
HCO,
5.46
NH4*
7.35
CH3CO,
4.09
H+
34.96
OH
19.91
![QUESTION 1
a) Calculate ionic strength (Im) and mean activity coefficient (y+) for a 0.050 m solution of
Ca(NO3)2 at 298 K. Given that: A = 0.509 for aqueous solution at 25 °C. [y+
0.403]
b) The molar conductivity (A) of 0.0250 M HCOOH (aq) was measured at 4.61 mS m? mol1.
By referring to Table 1, calculate
i) molar conductivity of infinite dilution (A.) of HCOOH (aq) (in unit ms m? mol1)
[40.42 ms m² mol1]
ii) degree of dissociation (a) of HCOOH (aq) [0.114]
iii) acidity constant (K,) [3.67×104]
iv) pka [3.44]
(41,0+)(aa-),
(hint: HA (aq) + H2O (I) = H3O* (aq) + A´ (aq), Ka
аНА
c) Calculate the solubility (s) of BaSO4 (Ksp = 1.08×10-10)
i) in pure H20 [1.04×10$]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F93fb09af-4b0b-4914-96b4-4a1ebb2e50e6%2F7934bf5c-a837-469e-9e10-c4861527736c%2Ftj2ywe_processed.jpeg&w=3840&q=75)
Transcribed Image Text:QUESTION 1
a) Calculate ionic strength (Im) and mean activity coefficient (y+) for a 0.050 m solution of
Ca(NO3)2 at 298 K. Given that: A = 0.509 for aqueous solution at 25 °C. [y+
0.403]
b) The molar conductivity (A) of 0.0250 M HCOOH (aq) was measured at 4.61 mS m? mol1.
By referring to Table 1, calculate
i) molar conductivity of infinite dilution (A.) of HCOOH (aq) (in unit ms m? mol1)
[40.42 ms m² mol1]
ii) degree of dissociation (a) of HCOOH (aq) [0.114]
iii) acidity constant (K,) [3.67×104]
iv) pka [3.44]
(41,0+)(aa-),
(hint: HA (aq) + H2O (I) = H3O* (aq) + A´ (aq), Ka
аНА
c) Calculate the solubility (s) of BaSO4 (Ksp = 1.08×10-10)
i) in pure H20 [1.04×10$]
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