Homework Answers
Ka
is the acid dissociation constant.c large Ka value indicates a
strong acid because it means the acid is largely dissociated into
its ions. A large Ka value also means the formation of products in
the reaction is favored.The Ka value for most weak acids ranges
from 10-2 to 10-14.
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4. (4 points) Complete each of the acid base reactions below and determine which direction the...
Using the titration curve below for an unknown weak acid which has a half-equivalence point at...
Using the titration curve below for an unknown weak acid which has a half-equivalence point at pH = 7.20, calculate the K, of the weak acid and select it from the list below. Acid Formula Acetic acid HC2H302 1.8 x 10-5 Carbonic acid H2CO3 Hydrocyanic acid HCN Hydrosulfuric acid H2S Dihydrogen phosphate H2PO4 4.3 x 107 4.9X 10-10 8.9 X 10-8 6.2 x 10-8 Equivalence Point рн Half-Equivalence Point Volume added
What is the pH of a buffer solution containing 0.13 M HF and 5.0×10−2 M NaF?...
What is the pH of a buffer solution containing 0.13 M HF and
5.0×10−2 M NaF?
What is the pH of a buffer solution containing
1.0×10−2 M HF and 0.16 M NaF?
Using the table given below for Ka values, compare the pH of an HF buffer that contains 0.13 MHF and 5.0x10-2 M NaF with another HF buffer that contains 1.0x10-2 MHF and 0.16 M NaF. Ka and K b values for selected weak acids and bases HF Acid...
Complete the following table of conjugate acid/base pairs. 1.66 points Acid Conjugate Base Conjugate Acid (8...
Complete the following table of conjugate acid/base pairs. 1.66 points Acid Conjugate Base Conjugate Acid (8 00:25:59 Base NH HCI Br CH,NH, eBook CH,COOH CN- он- HAPO, Print HPO 2 1 HO HSO, HI References | H, SO | NH: 1L HBr | PO 1 CH CON GI OH C HCH NH, | HO || SO2 HEO HPO, | HCN. NH H,PO,
4. Using Table 15B-4, indicate the stronger acid in each pair. a. HI, H, SO b....
4. Using Table 15B-4, indicate the stronger acid in each pair. a. HI, H, SO b. HF HCN c. H2O2, HCHO, d. H_BO4, H3PO4 ssholds as e. HCl, HClO ahle 158-4 Relative Strengths of Some Acids and Bases Acid K very large very large very large very large very large very large Perchloric acid Hydriodic acid Hydrobromic acid Hydrochloric acid Sulfuric acid Nitric acid Sulfurous acid Hydrogen sulfate ion Phosphoric acid Hydrofluoric acid Formic acid Acetic acid Carbonic acid Hypochlorous...
Problems dentify the acid, base, conjugate acid, and conjugate base in the following reactions (4 pts....
Problems dentify the acid, base, conjugate acid, and conjugate base in the following reactions (4 pts. each) 1 a) HCO, (aq)+SO. (aq)co2 (aq) + Hsos (aq) b) HCH,coo (aq) + HS (aq) CHbCoo (aq) + H2S (aq) 2. Identify the Lewis acid, Lewis base in the following reactions. (1 pt. each) a) 4 NH3 Zn Zn(NH3)2 Circle which acid in each of the following pairs has the stronger conjugate base.- (1 pt. each) HF a. HCI b. CH COOH HSO4
Ka values: HCI HNO3 H2SO4 strong strong strong 1.3 x 10-2 7.5 x 103 7.1 x...
Ka values: HCI HNO3 H2SO4 strong strong strong 1.3 x 10-2 7.5 x 103 7.1 x 10-4 4.5 x 10-4 1.7 x 10-4 CH3COOH CsH5NH+ H2CO3 H2PO4 HSO4- H3PO4 HF HNO2 HCOOH 1.8 x 100 5.9 x 10-6 4.2 x 10-7 6.2 x 10-8 5.6 x 10-10 4.9 x 10-10 4.8 x 10-11 4.8 x 10-13 NH1+ HCN HCO3- HPO4 6) (20 points) What is the pH of 0.065 M H2CO3 (carbonic acid)? 7) (20 points) What is the pH...
Propose buffer components to hold a pH = 5.5 Let the acid have a concentration of...
Propose buffer components to hold a pH = 5.5 Let the acid have a
concentration of 0.12 M.
Identity Concentration
Acid ? 0.12 M
Base ? ?
Ksp values: CaCO3 CaF2 Ca(OH)2 Ca3(PO4)2 Fe(OH)2 Fe(OH)3 MgCO3 8.7 x 10-9 4.0 x 10-11 8.0 x 10-6 1.2 x 10-26 1.6 x 10-14 1.1 x 10-36 4.0 x 10-5 Mg(OH)2 AgBr AgaCO3 AgCl Ag2SO4 Zn(OH)2 1.2 x 10-11 7.7 x 10-13 8.1 x 10-12 1.6 x 10-10 1.4 x 10" 1.8 x...
Propose buffer components to hold a pH = 4.0. Let the acid have a concentration of...
Propose buffer components to hold a pH = 4.0. Let the acid have a
concentration of 0.21 M.
Identity Concentration
Acid ? 0.21 M
Base ? ?
Ksp values: CaCO3 CaF2 Ca(OH)2 Ca3(PO4)2 Fe(OH)2 Fe(OH)3 MgCO3 8.7 x 10-9 4.0 x 10-11 8.0 x 10-6 1.2 x 10-26 1.6 x 10-14 1.1 x 10-36 4.0 x 10-5 Mg(OH)2 AgBr AgaCO3 AgCl Ag2SO4 Zn(OH)2 1.2 x 10-11 7.7 x 10-13 8.1 x 10-12 1.6 x 10-10 1.4 x 10" 1.8 x...
fill out the table. pKa=-log(Ka) Acid pk, Base Ko K 1.4 x 102 1 HSO, N...
fill out the table. pKa=-log(Ka)
Acid pk, Base Ko K 1.4 x 102 1 HSO, N 1.0 x 10-12 H2SO3 HSO4 CH3C(O)COOH HF 3 2.8 x 10 4 3.17 1.5 x 10-11 F CH3COO 5 1.8 x 10-5 4.5 x 10 6 H2CO3 HENCH2CH2NH2 7 7.1 x 10 1.1 x 107 HS 8 9 H2PO4 7.20 1.8 x 10 10 9.31 NH3 CN CO2- 11 2.1 x 10 12 13 HPO? 4.2 x 10-13
Propose buffer components to hold a pH = 10.8 Let the base have a concentration of...
Propose buffer components to hold a pH = 10.8
Let the base have a concentration of 0.35 M.
Identity Concentration
Acid ? ?
Base ? 0.35 M
Ksp values: CaCO3 CaF2 Ca(OH)2 Ca3(PO4)2 Fe(OH)2 Fe(OH)3 MgCO3 8.7 x 10-9 4.0 x 10-11 8.0 x 10-6 1.2 x 10-26 1.6 x 10-14 1.1 x 10-36 4.0 x 10-5 Mg(OH)2 AgBr AgaCO3 AgCl Ag2SO4 Zn(OH)2 1.2 x 10-11 7.7 x 10-13 8.1 x 10-12 1.6 x 10-10 1.4 x 10" 1.8 x...
Using the titration curve below for an unknown weak acid which has a half-equivalence point at pH = 7.20, calculate the K, of the weak acid and select it from the list below. Acid Formula Acetic acid HC2H302 1.8 x 10-5 Carbonic acid H2CO3 Hydrocyanic acid HCN Hydrosulfuric acid H2S Dihydrogen phosphate H2PO4 4.3 x 107 4.9X 10-10 8.9 X 10-8 6.2 x 10-8 Equivalence Point рн Half-Equivalence Point Volume added
What is the pH of a buffer solution containing 0.13 M HF and
5.0×10−2 M NaF?
What is the pH of a buffer solution containing
1.0×10−2 M HF and 0.16 M NaF?
Using the table given below for Ka values, compare the pH of an HF buffer that contains 0.13 MHF and 5.0x10-2 M NaF with another HF buffer that contains 1.0x10-2 MHF and 0.16 M NaF. Ka and K b values for selected weak acids and bases HF Acid...
Complete the following table of conjugate acid/base pairs. 1.66 points Acid Conjugate Base Conjugate Acid (8 00:25:59 Base NH HCI Br CH,NH, eBook CH,COOH CN- он- HAPO, Print HPO 2 1 HO HSO, HI References | H, SO | NH: 1L HBr | PO 1 CH CON GI OH C HCH NH, | HO || SO2 HEO HPO, | HCN. NH H,PO,
4. Using Table 15B-4, indicate the stronger acid in each pair. a. HI, H, SO b. HF HCN c. H2O2, HCHO, d. H_BO4, H3PO4 ssholds as e. HCl, HClO ahle 158-4 Relative Strengths of Some Acids and Bases Acid K very large very large very large very large very large very large Perchloric acid Hydriodic acid Hydrobromic acid Hydrochloric acid Sulfuric acid Nitric acid Sulfurous acid Hydrogen sulfate ion Phosphoric acid Hydrofluoric acid Formic acid Acetic acid Carbonic acid Hypochlorous...
Problems dentify the acid, base, conjugate acid, and conjugate base in the following reactions (4 pts. each) 1 a) HCO, (aq)+SO. (aq)co2 (aq) + Hsos (aq) b) HCH,coo (aq) + HS (aq) CHbCoo (aq) + H2S (aq) 2. Identify the Lewis acid, Lewis base in the following reactions. (1 pt. each) a) 4 NH3 Zn Zn(NH3)2 Circle which acid in each of the following pairs has the stronger conjugate base.- (1 pt. each) HF a. HCI b. CH COOH HSO4
Ka values: HCI HNO3 H2SO4 strong strong strong 1.3 x 10-2 7.5 x 103 7.1 x 10-4 4.5 x 10-4 1.7 x 10-4 CH3COOH CsH5NH+ H2CO3 H2PO4 HSO4- H3PO4 HF HNO2 HCOOH 1.8 x 100 5.9 x 10-6 4.2 x 10-7 6.2 x 10-8 5.6 x 10-10 4.9 x 10-10 4.8 x 10-11 4.8 x 10-13 NH1+ HCN HCO3- HPO4 6) (20 points) What is the pH of 0.065 M H2CO3 (carbonic acid)? 7) (20 points) What is the pH...
Propose buffer components to hold a pH = 5.5 Let the acid have a
concentration of 0.12 M.
Identity Concentration
Acid ? 0.12 M
Base ? ?
Ksp values: CaCO3 CaF2 Ca(OH)2 Ca3(PO4)2 Fe(OH)2 Fe(OH)3 MgCO3 8.7 x 10-9 4.0 x 10-11 8.0 x 10-6 1.2 x 10-26 1.6 x 10-14 1.1 x 10-36 4.0 x 10-5 Mg(OH)2 AgBr AgaCO3 AgCl Ag2SO4 Zn(OH)2 1.2 x 10-11 7.7 x 10-13 8.1 x 10-12 1.6 x 10-10 1.4 x 10" 1.8 x...
Propose buffer components to hold a pH = 4.0. Let the acid have a
concentration of 0.21 M.
Identity Concentration
Acid ? 0.21 M
Base ? ?
Ksp values: CaCO3 CaF2 Ca(OH)2 Ca3(PO4)2 Fe(OH)2 Fe(OH)3 MgCO3 8.7 x 10-9 4.0 x 10-11 8.0 x 10-6 1.2 x 10-26 1.6 x 10-14 1.1 x 10-36 4.0 x 10-5 Mg(OH)2 AgBr AgaCO3 AgCl Ag2SO4 Zn(OH)2 1.2 x 10-11 7.7 x 10-13 8.1 x 10-12 1.6 x 10-10 1.4 x 10" 1.8 x...
fill out the table. pKa=-log(Ka)
Acid pk, Base Ko K 1.4 x 102 1 HSO, N 1.0 x 10-12 H2SO3 HSO4 CH3C(O)COOH HF 3 2.8 x 10 4 3.17 1.5 x 10-11 F CH3COO 5 1.8 x 10-5 4.5 x 10 6 H2CO3 HENCH2CH2NH2 7 7.1 x 10 1.1 x 107 HS 8 9 H2PO4 7.20 1.8 x 10 10 9.31 NH3 CN CO2- 11 2.1 x 10 12 13 HPO? 4.2 x 10-13
Propose buffer components to hold a pH = 10.8
Let the base have a concentration of 0.35 M.
Identity Concentration
Acid ? ?
Base ? 0.35 M
Ksp values: CaCO3 CaF2 Ca(OH)2 Ca3(PO4)2 Fe(OH)2 Fe(OH)3 MgCO3 8.7 x 10-9 4.0 x 10-11 8.0 x 10-6 1.2 x 10-26 1.6 x 10-14 1.1 x 10-36 4.0 x 10-5 Mg(OH)2 AgBr AgaCO3 AgCl Ag2SO4 Zn(OH)2 1.2 x 10-11 7.7 x 10-13 8.1 x 10-12 1.6 x 10-10 1.4 x 10" 1.8 x...
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