Drill: Calculate the pH of 0.10 M H 2 Z in 0.50 M KHZ. K a1 = 2.0 x 10 -5 K a2 = 5.0 x 10 -9
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Transcript of Drill: Calculate the pH of 0.10 M H 2 Z in 0.50 M KHZ. K a1 = 2.0 x 10 -5 K a2 = 5.0 x 10 -9
![Page 1: Drill: Calculate the pH of 0.10 M H 2 Z in 0.50 M KHZ. K a1 = 2.0 x 10 -5 K a2 = 5.0 x 10 -9](https://reader036.fdocuments.us/reader036/viewer/2022062408/56813525550346895d9c8f55/html5/thumbnails/1.jpg)
Drill: Calculate the pH of 0.10 M H2Z in
0.50 M KHZ.Ka1 = 2.0 x 10-5
Ka2 = 5.0 x 10-9
![Page 2: Drill: Calculate the pH of 0.10 M H 2 Z in 0.50 M KHZ. K a1 = 2.0 x 10 -5 K a2 = 5.0 x 10 -9](https://reader036.fdocuments.us/reader036/viewer/2022062408/56813525550346895d9c8f55/html5/thumbnails/2.jpg)
Salt orHydrolysis Reactions
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HydrolysisAny reaction in which water
is decomposed with all or part of its decomposition
portions combining with the products
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Hydrolysis
Water is added to decompose something
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Hydrolysis
MX + HOH
HX + MOH
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Salts
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Salts•Ionic compounds
that dissolve ~ 100 % in water
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Salts of Acids•Salts of acids are
negative
(A-)
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Salts of Bases•Salts of bases are
Positive
(M+ or B+)
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Salt Solutions•When salts dissolve,
their ions can recombine with water
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Salt Solutions•The salts of weak acids
can recombine with water producing basic
solutions
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Salt Solutions•The salts of weak bases can recombine with water producing
acidic solutions
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Salt Solutions
A- + H2O HA + OH-
B+ + H2O H+ + BOH
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Drill: Calculate the salt/acid ratio of a
solution of benzoic acid & sodium benzoate at a
pH of 5.00.Ka HBz = 6.4 x 10-5
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Salt or Hydrolysis Problems
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Salt Problem•Calculate the pH of
a 0.20 M solution of NaBz
•Ka HBz = 6.4 x 10-5
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Drill: Calculate the pH of a solution of
0.10 M NH3 in 0.20 NH4Cl.
Kb NH3 = 1.8 x 10-5
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Salt or Hydrolysis Problems
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Salt Problem•Calculate the pH of
a 0.20 M solution of KNO2
•Ka HNO2 = 7.1 x 10-4
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Salt Problem•Calculate the pH of a
0.10 M solution of R-NH3Cl
•Kb R-NH2 = 2.5 x 10-5
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Calculate the pH of a 0.18 M solution
of KC2H3O2
•Ka = 1.8 x 10-5
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Drill: Calculate the salt to acid ratio required to make a buffer solution
with a pH of 4.495 using benzoic acid.Ka HBz = 6.4 x 10-5
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Salt Applications
•Salts of strong acids & weak bases make
acidic solutions
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Salt Applications
•Salts of strong bases & weak acids make
basic solutions
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Salt Applications
•Salts of strong acids & strong bases make
neutral solutions
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Predict Relative pH
•NaAc MnCl2
•KNO3 NH4Br
•KHSO4 NH4Ac
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Predict Relative pH
•KAc NaCl
•KClO2 NH4Cl
•K2SO4 NaI
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Anhydrides•Compounds without
water; that when added to water, form
other compounds
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Acid Anhydrides
•Non-metal oxides that form acids when
added to water
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Basic Anhydrides
•Metal oxides that form bases when added to water
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Predict Relative pH
•Na2O SO2
•NO2 CO2
•CaO Al2O3
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Calculate the pH of a 0.16 M solution
of KC7H5O2
•Ka = 6.4 x 10-5
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•Calculate the pH of a solution of 0.0030 M KQ.
•Ka HQ = 3.0 x 10-5
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Drill: Calculate the pH of a 0.72 M
NH4NO3 solution.Kb NH3 = 1.8 x 10-5
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Are there any questions on
previous material?
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A/B eq, Buffer & Salt
Hydrolysis Problem
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Calculate [H3PO4], [H2PO4-1],
[HPO4-2], [PO4
-3], [K+], [H+], & pH of 1.0 M KH2PO4 in
0.50 M K2HPO4. Ka1 = 7.5 x 10-3
Ka2 = 6.2 x 10-8
Ka3 = 4.2 x 10-13
![Page 38: Drill: Calculate the pH of 0.10 M H 2 Z in 0.50 M KHZ. K a1 = 2.0 x 10 -5 K a2 = 5.0 x 10 -9](https://reader036.fdocuments.us/reader036/viewer/2022062408/56813525550346895d9c8f55/html5/thumbnails/38.jpg)
You need to make a buffer solution with its greatest
buffering capacity at pH ~ 5.4. In general terms,
describe what acid or base you would chose, & how
you would make the buffer.
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11.2 g of KOH was added to 2.0 L of 0.075 M
H2CO3. Calculate the molarity of all ions
present in the solution.Ka1 = 4.4 x 10-7
Ka2 = 4.8 x 10-11
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Drill: Calculate the pH of
0.10 M HF. Ka HF = 6.5 x 10-4
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Test Review
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Expect a straight acid/base
problem like the drill
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Calculate the pH of 0.10 M HF in
0.20 M KF. Ka HF = 6.5 x 10-4
![Page 44: Drill: Calculate the pH of 0.10 M H 2 Z in 0.50 M KHZ. K a1 = 2.0 x 10 -5 K a2 = 5.0 x 10 -9](https://reader036.fdocuments.us/reader036/viewer/2022062408/56813525550346895d9c8f55/html5/thumbnails/44.jpg)
Calculate the pH of 0.10 M KF.
Ka HF = 6.5 x 10-4
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Predict Relative pH
K2O MgO
ClO2 (NH4)2O
SO3 N2O3
![Page 46: Drill: Calculate the pH of 0.10 M H 2 Z in 0.50 M KHZ. K a1 = 2.0 x 10 -5 K a2 = 5.0 x 10 -9](https://reader036.fdocuments.us/reader036/viewer/2022062408/56813525550346895d9c8f55/html5/thumbnails/46.jpg)
Predict Relative pH
•KAc NaCl
•KClO2 NH4Cl
•K2SO4 NaI
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Calculate the pH of 5.0 M KCN.
KaHCN= 5.0 x 10-10
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Calculate pH of:0.20 M MOH in
0.50 M MCl
Kb = 5.0 x 10-5
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Calculate pH of:0.20 M MCl
Kb = 5.0 x 10-5
![Page 50: Drill: Calculate the pH of 0.10 M H 2 Z in 0.50 M KHZ. K a1 = 2.0 x 10 -5 K a2 = 5.0 x 10 -9](https://reader036.fdocuments.us/reader036/viewer/2022062408/56813525550346895d9c8f55/html5/thumbnails/50.jpg)
Drill: Calculate the pH of
0.20 M KQ. Ka HQ = 8.0 x 10-5
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Calculate pH of:
•0.20 M HNO2
•Ka = 2.0 x 10-4
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Calculate pH of:•3.0 M HZ in
2.0 M KZ•Ka HZ = 3.0 x 10-5
![Page 53: Drill: Calculate the pH of 0.10 M H 2 Z in 0.50 M KHZ. K a1 = 2.0 x 10 -5 K a2 = 5.0 x 10 -9](https://reader036.fdocuments.us/reader036/viewer/2022062408/56813525550346895d9c8f55/html5/thumbnails/53.jpg)
Calculate pH of:
•0.20 M KR
•Ka HR = 2.0 x 10-5
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Calculate pH of:
•2.0 M HQ
•Ka = 2.0 x 10-6
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Calculate pH of:•0.60 M HZ in
0.90 M KZ•Ka HZ = 3.0 x 10-5
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Calculate pH of:
•0.20 M KQ
•Ka HQ = 2.0 x 10-7
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1.5 L of 0.25 M Ba(OH)2 was added to 1.0 L of 0.60 M
H2SO3. Calculate [H2SO3], [HSO3
-], [SO3-2], [H+], [OH-],
& pH of the solution.Ka1 = 1.7 x 10-2
Ka2 = 6.0 x 10-8
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Review of Acid/Base descriptions and
Acid/Base, Buffer, & Salt Equilibria
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Arhenius, Bronsted-Lowry, & Lewis Acids & Bases
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Strong Acids
Strong Bases
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Acid rxns
Base rxns
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A/B Equilibrium Constants
KW, KA, KB, & pH
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Calculate pH of:
•0.025 M HNO3
•0.020 M KOH
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150 mL of 0.10 M KOH was added to 100.0 mL of 0.10 M H2CO3. Calculate [H2CO3],
[HCO3-], [CO3
-2], [H+], [OH-], & pH of the solution.
Ka1 = 4.4 x 10-7
Ka2 = 4.7 x 10-11
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Calculate [H3A], [H2A-1], [HA-2], [A-3], [K+], [H+],
[OH-], & pH of 2.0 M KH2A. Ka1 = 4.0 x 10-3
Ka2 = 5.0 x 10-8
Ka3 = 2.5 x 10-13
![Page 66: Drill: Calculate the pH of 0.10 M H 2 Z in 0.50 M KHZ. K a1 = 2.0 x 10 -5 K a2 = 5.0 x 10 -9](https://reader036.fdocuments.us/reader036/viewer/2022062408/56813525550346895d9c8f55/html5/thumbnails/66.jpg)
The take-home portion of the test is due by
8:15 tomorrow