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chemistry salt analysis > cations > Flashcards

cations Flashcards

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1
Q

ammonia (NH3+)

A

group 0: to soln, Na2CO3. no precipitate.
conf 1: heat salt w NaOH. dense fumes w rod dipped in HCl
conf 2: heat salt with nesslers reagent (K2[HgI]4). brown ppt

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2
Q

lead (Pb2+)

A

g1: soln add dil. HCl. white ppt
conf 1: soln add potassium chromate. yellow ppt
conf 2: soln add potassium iodide. “ dissolves hot, spangles cooled

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3
Q

copper (Cu2+)

A

g2: soln add dil HCl & H2S. black ppt.
conf 1: soln add potassium ferrocyanide. reddish brown ppt
conf 2: soln add 50% HNO3 + NH4OH drops. blue soln.

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4
Q

aluminium (al3+)

A

g3: soln add solid NH4Cl, excess NH4OH. gelatinous ppt
conf 1: lake test: blue litmus soln acidify w dil hcl, add NH4OH
conf 2: ash test: blue tinted ash

ash test: dissolve salt in conc hno3, few drops co(no3)2, soak & burn

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5
Q

iron (fe3+)
manganese (mn2+)
nickel (ni2+)

no colored salts for analysis; skip (im not sure if viva is there tho)

A
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6
Q

zinc (zn2+)

A

g4: soln add solid NH4Cl, NH4OH, H2S. dirty white ppt.
conf 1: soln add exc NaOH. white ppt.
conf 2: ash test. green ash

ash test: dissolve salt in conc hno3, few drops co(no3)2, soak & burn

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7
Q

cobalt (co2+)

A

g4: soln add NH4CL, NH4OH, H2S. black ppt.
conf 1: soln add exc NaOH, warm. blue->pink ppt
conf 2: soln add NH4Cl, NH4OH, K4[Fe(CN)6]. grassy green ppt.

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8
Q

barium (Ba2+)

A

g5: NH4Cl, NH4OH, (NH4)2CO3. white ppt.
conf 1: soln add potassium chromate. yellow ppt.
conf 2: flame test. apple green.

flame: conc hcl paste glass rod watch glass

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9
Q

calcium (ca2+)

A

g5: NH4Cl, NH4OH, (NH4)2CO3
conf 1: soln add NH4OH & ammonium oxalate. white crys ppt insol in acetic acid
conf 2: flame test. brick red.

flame: conc hcl paste glass rod watch glass

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10
Q

magnesium (mg2+)

A

g6: NH4Cl solid, NH4OH, ammonium dihydrogen phosphate. white ppt.
conf 1: little NH4OH. white ppt
conf 2: ash test: pink ash

ash test: dissolve salt in conc hno3, few drops co(no3)2, soak & burn

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11
Q

strontium (sr2+)

A

g5: solid NH4Cl, NH4OH, (NH3)2CO3
conf 1: soln add ammonium sulphate & warm. white ppt.
conf 2: flame test. crimson red

flame: conc hcl paste glass rod watch glass

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12
Q

freebie. u can do this babe.

A
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chemistry salt analysis (3 decks)

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