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Polyatomic Anions

Polyatomic anions
are made up more than one atom. Among the commonly encountered polyatomic anions are
hydroxide OH-

found in bases such as
lithium hydroxide LiOH
potassium hydroxide KOH
sodium hydroxide NaOH
calcium hydroxide Ca(OH)2
ammonium hydroxide NH4OH

nitrate NO3-

found in
potassium nitrate KNO3
sodium nitrate NaNO3
ammonium nitrate NH4NO3
silver nitrate AgNO3
calcium nitrate Ca(
NO3)2
copper (II) nitrate 
Cu(NO3)2
lead (II) nitrate Pb(NO3)2

*all nitrate
salts are soluble in water

sulphate SO42-

found in
potassium sulphate K2SO4
sodium sulphate Na
2SO4
ammonium sulphate (NH4
)2SO4
calcium sulphate CaSO4
copper (II) sulphate 
CuSO4
lead (II) sulphate PbSO4
barium sulphate BaSO4

PbSOBaSO4 and CaSO4 are insoluble in water
carbonate CO32-

found in
potassium carbonate K2CO3
sodium carbonate Na
2
CO3
calcium carbonate Ca
CO3
copper (II) carbonate
Cu
CO3
lead (II) carbonate Pb
CO3


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Anion Poliatomik

Anion poliatomik terdiri daripada lebih satu atom. Di antara anion poliatomik adalah hidroksida OH-, nitrat NO3-, sulfat SO42-  dan karbonat CO32- .
hidroksida OH-

contoh-contoh
litium hidroksida LiOH
kalium
hidroksida KOH
natrium
hidroksida NaOH
kalsium
hidroksida Ca(OH)2
amonium
hidroksida NH4OH

nitrat NO3-

contoh-contoh
kalium nitrat KNO3
natrium
nitrat NaNO3
amonium nitrat NH4NO3
argentum nitrat AgNO3
k
alsium nitrat Ca(
NO3)2
kuprum (II) nitrat
Cu(NO3)2
plumbum
(II) nitrat Pb(NO3)2

*semua
garam nitrat boleh larut dalam air

sulfat SO42-

contoh-contoh
kalium
sulfat K2SO4
natrium
sulfat Na
2SO4
amonium sulfat (NH4
)2SO4
kalsium sulfat CaSO4
kuprum (II) sulfat
CuSO4
plumbum (II) sulfat PbSO4
barium sulfat BaSO4

PbSOBaSO4 dan CaSO4 tidak larut dalam air

karbonat CO32-

contoh-contoh
kalium karbonat K2CO3
natr
ium karbonat Na
2
CO3
kalsium karbonat Ca
CO3
kuprum (II) karbonat
Cu
CO3
plumbum (II) karbonat Pb
CO3

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