'Common Polyatomic Ions' Chemistry Chart
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1Table of Some Common Polyatomic Ions
Formulae
Constants and Conversions
=
∆
q mc T
1 – Ions
2 – Ions
3 – Ions
Quantity
Symbol
Value
Formula
Name
Formula Name
Formula Name
23
= ∆
Avogadro’s Number
N
6.022 × 10
q C T
A
–
2–
3–
H
PO
dihydrogen phosphate
HPO
hydrogen phosphate
PO
phosphate
o
standard temperature
0.00
C and
2
4
4
4
STP
–
2–
3–
H
PO
dihydrogen phosphite
HPO
hydrogen phosphite
PO
phosphite
= ∆
q n H
and pressure
101.3 kPa
2
3
3
3
–
2–
3–
mol
HCO
hydrogen carbonate
CO
carbonate
BO
borate
3
3
3
–
2–
molar volume for a gas
HSO
hydrogen sulfate
SO
sulfate
+
4
4
= −
MV
22.4 L/mol
pH
log H O
–
2–
HSO
hydrogen sulfite
SO
sulfite
@ STP
3
3
3
–
2–
BrO
bromate
C
O
oxalate
3
2
4
auto-ionization
=
–
2–
Q It
CH
COO
acetate
CrO
chromate
–14
3
4
K
1.00 × 10
constant of water
–
2–
W
C
H
COO
benzoate
Cr
O
dichromate
6
5
2
7
o
@ 25
C
2–
–
S
O
thiosulfate
ClO
hypochlorite
=
2
3
Q n F
2–
–
SiO
silicate
ClO
chlorite
e
3
2
enthalpy of
o
–
∆H
ClO
chlorate
fusion for
6.02 kJ/mol
3
fus
1 + Ions
(
)
(
)
∆ °
= Σ ∆ °
− Σ ∆ °
–
H
n H products
n H reactants
o
ClO
perchlorate
water @ 0
C
4
rxn
f
f
–
CN
cyanide
Formula
Name
(
)
(
)
enthalpy of
–
IO
iodate
∆
= Σ
− Σ
H
BE reactants
BE products
3
o
∆H
40.7 kJ/mol
–
rxn
vaporization for water
vap
OH
hydroxide
+
NH
ammonium
4
o
–
@ 100.0
C
NO
nitrate
+
3
H
O
hydronium
3
− ±
−
2
–
b
b
4
ac
NO
nitrite
2
=
specific heat of
x
–
o
MnO
permanganate
c
4.184 J/g
C
4
2
a
o
water
water @ 25.0
C
–
SCN
thiocyanate
o
specific heat of ice
c
2.03 J/g
C
ice
o
specific heat of steam
c
2.01 J/g
C
steam
Faraday’s Constant
F
96500 C/mol
–
–
3 –
Group IA,
ClO
,
Cl
,
PO
,
3
4
+
–
–
–
2 –
2 –
–
2 –
Ions
NH
,
NO
,
Br
,
CH
COO
SO
S
OH
SO
,
4
3
3
4
3
+
+
–
–
2 –
Solubility Rules
H
(H
O
)
ClO
I
CO
3
4
3
for Ionic Compounds
Group IA,
Group IA ,
Group IA,
(aq)
+
2+
+
o
high Solubility
all
all
most
most
most
Group IIA,
NH
, Sr
,
NH
in Water at 25
C
4
4
+
2+
+
(> 0.1 mol/L)
NH
Ba
, Tl
4
+
+
2+
2+
Ag
, Tl
,
Ca
, Sr
,
(s)
2+
+
+
+
2+
2+
low Solubility
none
none
Hg
, Hg
,
Ag
, Hg
Ba
, Ra
,
most
most
most
2
+
2+
2+
+
(< 0.1 mol/L)
Cu
, Pb
Pb
, Ag
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