Acidity Cheat Sheet
ADVERTISEMENT
1If a salt is formed from the:
Conjugate Acid of a
and the Conjugate Base of a
The Solution Will be
Strong base
Strong acid
Neutral
Strong base
Weak acid
Basic
Weak base
Strong acid
Acidic
K
> K
Acidic
a
b
Weak base
Weak acid
K
< K
Basic
a
b
K
= K
Neutral
a
b
+
Na
CO
Na
conjugate acid of a strong base (NaOH).
3
3
2-
-
CO
conjugate base of a weak acid (HCO
).
3
3
Therefore the solution will be basic.
+
KI
K
conjugate acid of a strong base (KOH).
-
I
conjugate base of a strong acid (HI).
Therefore the solution will be neutral.
+
NH
Cl
NH
conjugate acid of a weak base (NH
).
4
4
3
-
Cl
conjugate base of a strong acid (HCl).
Therefore the solution will be acidic.
3+
+
Al
(SO
)
Al
conjugate acid of a weak base (Al(OH)
).
2
4
3
2
2-
-
SO
conjugate base of a weak acid (HSO
).
4
4
Therefore, it is necessary to look at K
and K
values
a
b
3+
-5
+
-13
Al
K
= 1.0×10
(Al(OH)
K
= 1.0×10
)
a
2
b
2-
-13
-
-2
SO
K
= 8.3×10
(HSO
K
= 1.2×10
)
4
b
4
a
Therefore since K
> K
the solution will be acidic
a
b
K
values for all ions listed below.
a
Conjugate
Ion
Conjugate
K
(Ion)
K
(Ion)
a
b
Strong/Weak
+
Na
NaOH
Strong
N/A
2-
-
-4
CO
HCO
Weak
2.1 × 10
3
3
+
-10
NH
NH
Weak
5.6 × 10
4
3
-
Cl
HCl
Strong
N/A
+
K
KOH
Strong
N/A
-
I
HI
Strong
N/A
3+
+
-5
Al
Al(OH)
Weak
1.0 × 10
2
2-
-
-13
SO
HSO
Weak
8.3 × 10
4
4
ADVERTISEMENT
0 votes
Related Articles
Related forms
Related Categories
Parent category: Education