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Chem SPA
Thursday, March 29, 2007 @ 9:49 PM
lala
let me juz memorise my cation and anion stuff

Cu(II): light blue ppt formed wif dilute sodium hydroxide
ppt not soluble in excess sodium hydroxide
light blue ppt formed wif aqueous ammonia
ppt dissolved in excess aqueous ammonia to form dark blue solution

Fe(II): dirty green ppt formed wif dilute sodium hydroxide
ppt insoluble in excess dilute sodium hydroxide
dirty green ppt formed wif aqueous ammonia
ppt insoluble in excess aqueous ammonia

Fe(III): reddish brown ppt formed wif dilute sodium hydroxide
ppt insoluble in excess sodium hydroxide
reddish brown ppt formed wif aqueous ammonia
ppt insoluble in excess aqueous ammonia

Al2+: white ppt formed wif dilute sodium hydroxide
ppt dissolved in excess sodium hyroxide to form colourless solution
white ppt formed wif aqueous ammonia
ppt insoluble in excess aqueous ammonia

Zn2+: white ppt formed wif dilute sodium hydroxide
ppt dissolved in excess sodium hydroxide to form colourless solution
whtie ppt formed wif aqueous ammonia
ppt dissolved in excess aqueous ammonia to form colourless solution

Pb2+: white ppt formed wif dilute sodium hydroxide
ppt dissolved in excess sodium hydroxide to form colourless solution
white ppt formed wif aqueous ammonia
ppt insoluble in excess aqueous ammonia

Ca2+: white ppt formed wif dilute sodium hydroxide
ppt insoluble in excess sodium hydroxide
no visible reaction

NH4+: colourless pungent gas evolved upon heating.
gas turned moist red litmus blue
gas is ammonia
no observation

anion
Nitrate NO3-: add aqueous sodium hydroxide and warm gently
test for gas using moist red litmus
colourless pungent gas evolved
gas turned moist red litmus blue
gas produced is ammonia

Carbonate CO3 2-: add nitric acid
test for gas wif limewater (calcium hydroxide)
effervescence occurred
colourless odourless gas formed white ppt wif limewater
gas produced is carbon dioxide

Chloride Cl-: add nitric acid and aqueous silver nitrate
white ppt formed

Iodide I-: add nitric acid and aqueous lead (II) nitrate
white ppt formed

Sulphate SO4 2-: add nitric acid and aqueous barium nitrate
white ppt formed


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Chem SPA
Thursday, March 29, 2007 @ 9:49 PM
lala
let me juz memorise my cation and anion stuff

Cu(II): light blue ppt formed wif dilute sodium hydroxide
ppt not soluble in excess sodium hydroxide
light blue ppt formed wif aqueous ammonia
ppt dissolved in excess aqueous ammonia to form dark blue solution

Fe(II): dirty green ppt formed wif dilute sodium hydroxide
ppt insoluble in excess dilute sodium hydroxide
dirty green ppt formed wif aqueous ammonia
ppt insoluble in excess aqueous ammonia

Fe(III): reddish brown ppt formed wif dilute sodium hydroxide
ppt insoluble in excess sodium hydroxide
reddish brown ppt formed wif aqueous ammonia
ppt insoluble in excess aqueous ammonia

Al2+: white ppt formed wif dilute sodium hydroxide
ppt dissolved in excess sodium hyroxide to form colourless solution
white ppt formed wif aqueous ammonia
ppt insoluble in excess aqueous ammonia

Zn2+: white ppt formed wif dilute sodium hydroxide
ppt dissolved in excess sodium hydroxide to form colourless solution
whtie ppt formed wif aqueous ammonia
ppt dissolved in excess aqueous ammonia to form colourless solution

Pb2+: white ppt formed wif dilute sodium hydroxide
ppt dissolved in excess sodium hydroxide to form colourless solution
white ppt formed wif aqueous ammonia
ppt insoluble in excess aqueous ammonia

Ca2+: white ppt formed wif dilute sodium hydroxide
ppt insoluble in excess sodium hydroxide
no visible reaction

NH4+: colourless pungent gas evolved upon heating.
gas turned moist red litmus blue
gas is ammonia
no observation

anion
Nitrate NO3-: add aqueous sodium hydroxide and warm gently
test for gas using moist red litmus
colourless pungent gas evolved
gas turned moist red litmus blue
gas produced is ammonia

Carbonate CO3 2-: add nitric acid
test for gas wif limewater (calcium hydroxide)
effervescence occurred
colourless odourless gas formed white ppt wif limewater
gas produced is carbon dioxide

Chloride Cl-: add nitric acid and aqueous silver nitrate
white ppt formed

Iodide I-: add nitric acid and aqueous lead (II) nitrate
white ppt formed

Sulphate SO4 2-: add nitric acid and aqueous barium nitrate
white ppt formed








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