Staar Chemistry Reference Materials Page 3
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4STA
AR
STAAR CHEMISTRY
TM
REFERENCE MATERIALS
State of Texas
Assessments of
Academic Readiness
POLYATOMIC
SOLUBILITY OF COMMON
ACTIVITY
IONS
IONIC COMPOUNDS IN WATER
SERIES
Metal
−
−
Soluble
Common exceptions
Acetate
, CH COO
C H O
2 3 2
3
compounds contain
Lithium
+
Ammonium
NH
−
−
C H O
, CH COO
None
4
2 3 2
3
Potassium
+
NH
None
Carbonate
2−
CO
4
3
Barium
−
None
NO
3
−
Chlorate
ClO
Calcium
−
3
CN
None
Chlorite
−
−
ClO
Sodium
ClO
None
2
−
None
ClO
Magnesium
2−
Chromate
CrO
2
4
−
None
ClO
Aluminum
3
−
Cyanide
CN
−
ClO
None
Manganese
4
−
+
2+
Compounds of Ag
, Pb
, and Hg
2+
Br
2−
Dichromate
Cr O
2
Zinc
2
7
−
2+
+
2+
Cl
Compounds of Ag
, Pb
, and Hg
2
−
Hydrogen carbonate
HCO
Chromium
−
2+
3
+
2+
I
Compounds of Ag
, Pb
, and Hg
2
Iron
−
Hydroxide
2+
2+
OH
2−
2+
Compounds of Sr
, Ba
, Pb
, and Hg
2+
SO
4
2
Cobalt
−
Hypochlorite
ClO
Insoluble
Common exceptions
Nickel
compounds contain
Nitrate
−
NO
2−
3
+
Tin
CO
Compounds of NH
and the alkali metal cations
3
4
−
Nitrite
NO
Lead
3−
+
Compounds of NH
and the alkali metal cations
PO
2
4
4
(Hydrogen)
−
ClO
Perchlorate
2−
+
CrO
Compounds of NH
and the alkali metal cations
4
4
4
Copper
2−
+
Cr O
Compounds of NH
and the alkali metal cations
−
Permanganate
MnO
2
7
4
4
Mercury
−
+
OH
Compounds of NH
, the alkali metal cations,
3−
Phosphate
PO
4
4
Silver
2+
2+
2+
, Sr
, and Ba
Ca
2−
Sulfate
SO
Platinum
2−
+
S
Compounds of NH
, the alkali metal cations,
4
4
2+
2−
2+
2+
, Sr
, and Ba
SO
Ca
Gold
Sulfite
3
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