Equilibria
EquilibriaEquilibria
Equilibria
Chapter 17
Prepare for your exams
Study with the several resources on Docsity
Earn points to download
Earn points by helping other students or get them with a premium plan
Guidelines and tips
Prepare for your exams
Study with the several resources on Docsity
Earn points to download
Earn points by helping other students or get them with a premium plan
Community
Ask the community
Ask the community for help and clear up your study doubts
University Rankings
Discover the best universities in your country according to Docsity users
Free resources
Our save-the-student-ebooks!
Download our free guides on studying techniques, anxiety management strategies, and thesis advice from Docsity tutors
Notes on Equilibria, Buffers - General Chemistry II | CHEM 1200, Study notes of Chemistry
Material Type: Notes; Professor: Thomas; Class: General Chemistry II; Subject: Chemistry; University: Auburn University-Montgomery; Term: Unknown 1989;
Typology: Study notes
Pre 2010
1 / 16
This page cannot be seen from the preview
Don't miss anything!
Related documents
Partial preview of the text
Download Notes on Equilibria, Buffers - General Chemistry II | CHEM 1200 and more Study notes Chemistry in PDF only on Docsity!
EquilibriaEquilibriaEquilibriaEquilibria
C
hapter 17
Buffers Buffers
Buffers Buffers
Solutions that resist pHchange when small amountsof acid and base added Two types weak acid + its saltweak base + its salt
Common ion effect
Buffers Buffers
Buffers Buffers
HA
(aq)
+ H
2
O
(l)
H
3
O
(aq)
+A
(aq)
Add acid
left shift
Buffers Buffers
Buffers Buffers
HA
(aq)
+ H
2
O
(l)
H
3
O
(aq)
+A
(aq)
HHHHC
C
C C
2222
HHHH
3 3
3 3
O O
O O
2222
H
H
H
H
2222
O O
O O
º º
º º
H H
H H
3333
OOOO
C
C
C
C
2222
H H
H H
3333
OOOO
2222
Buffer pH depends on ratio ofconjugate acid-base pair
ADDINGADDINGADDINGADDING ACID/BASE
ACID/BASEACID/BASEACID/BASE TO
TOTOTO Buffers
Buffers
Buffers Buffers
BuffersBuffers andBuffersBuffers
and bloodandand
blood
blood blood
Oxygentransportedby hemoglobinCO
2
transportedin plasma andred blood cellsHCO
3
is buffer forcontrolling bloodpH
SolubilitySolubilitySolubilitySolubility product
productproductproduct
K
sp
equilbrium constant for lowsolubility ionic compounds
AgCl
(s)
Ag
(aq)
+ Cl
(aq)
K
sp
=[Ag
][Cl
]
SolubilitySolubilitySolubilitySolubility product
productproductproduct
AgCl
(s)
Ag
(aq)
+ Cl
(aq)
At equilibrium the system is asaturated solution of Ag
& Cl
Low
K
sp
means low solubility
SolubilitySolubilitySolubilitySolubility product
productproductproduct
Solubility
AgCl: 0.00188 g/L
Molar Solubility Ag
2
SO
4
: 0.015 mol/L
Given solubility or K
sp
, find other
Problem 1Problem 1Problem 1Problem 1
Find
K
sp
for Ag
2
CrO
4
Given solubility is 7.8 x 10
mol/L
Ag
2
CrO
4
2 Ag
CrO
4
2-
1 mol
2 mol +
1 mol
7.8 x 10
mol
²²²²
2 x 7.8 x 10
mol + 7.8 x 10
mol
K
sp
= [Ag
]
2
[CrO
4
2-
]
K
sp
= [2 x 7.8 x 10
]
2
[7.8 x 10
]
= 1.9 x 10
Problem 2Problem 2Problem 2Problem 2
Convert from mol/L to g/L
2.1 x 10
x 78 = 1.6 x 10
g/L