.1 Flashcards

1
Q

Classfication of Anions
i)Give Volatile Product with dil.H2SO4
ii)Give Volatile Product with conc.H2SO4

A

i)SO3-2,S-2,NO2-,CHCOO-,CO3-2,S2O3-2
ii)NO3-,C2O4-2,BO3-3,F-,Cl-,Br-,I-

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2
Q

Classfication of Anions
iii)By ppt
iv)By redox change

A

iii)PO4-3,SO4-2,AsO4-3,AsO3-3
iv)MnO4-,MnO4-2,CrO4-2,Cr2O7-2

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3
Q

1)CO3-2 + H+—->
2)SO3-2 + H+—>
3)S-2 + H+—->
4)CH3COO- + H+—->
5)S2O3-2 + H+—->
6)NO2- + H+—->

A

1)CO3-2 + H+—->H2CO3—->H2O + CO2(odorless,brisk effervescence)
2)SO3-2 + H+—->H2SO3—->H2O + SO2(colorless,pungent smell)
3) S-2 + H+—->H2S(colorless,rotten egg smell)
4)CH3COO- + H+—->(CH3COOH)2(colorless,vinegar like smell,fruity smell with alcohol)
5)S2O3-2 + H+—->S + H2SO3—->SO2
6)NO2- + H+—->HNO2—->HNO3+NO—O2->NO2(reddish-brown,pungent smell)

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4
Q

1)F- + conc. H2SO4—->
2)Cl- + conc. H2SO4—->
3)Br- + conc. H2SO4—->
4)I- + conc. H2SO4—->
5)C2O4-2 + conc. H2SO4—->

A

1)F- + conc.H2SO4—>H2F2(colorless,acidic,used to dissolve glass)
2)Cl- + conc. H2SO4—->HCl(colorless,pungent smell)
3) 3)Br- + conc. H2SO4—->HBr + Br2(reddish brown vapors,pungent smell)
4)I- + conc. H2SO4—->HI + I2(violet,pungent smell,blue color with starch)
5)C2O4-2 + conc. H2SO4—->CO2 + CO(neutral,burns with blue flame,poisonous)

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5
Q

6)BO3-3 + conc.H2SO4—->
BO3-3 + conc.H2SO4 + C2H5OH—->
7)NO3- + conc.H2SO4—->

A

6)BO3-3 + conc.H2SO4—->H3BO3
BO3-3 + conc.H2SO4 + C2H5OH—->B(C2H5O)3
7)NO3- + conc.H2SO4—->HNO3—->H2O + NO2 + O2

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6
Q

CO3-2:
i)M+ + CO3-2—->
ii)M+2 + CO3-2—->
iii)M+3 + CO3-2—->

A

i)M+ + CO3-2—->M2CO3
ii)if M = Ba+2,Sr+2,Ca+2,Fe+2 :
M+2 + CO3-2—->MCO3
else :
M+2 + CO3-2—->MCO3.M(OH)2
iii)if M = Cr,Al,Fe
M+3 + CO3-2—->M(OH)3

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7
Q

CO3-2:
i)M+ + CO3-2—->
ii)M+2 + CO3-2—->
iii)M+3 + CO3-2—->

A

i)M+ + CO3-2—->M2CO3
ii)if M = Ba+2,Sr+2,Ca+2,Fe+2 :
M+2 + CO3-2—->MCO3
else :
M+2 + CO3-2—->MCO3.M(OH)2
iii)if M = Cr,Al,Fe
M+3 + CO3-2—->M(OH)3

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8
Q

CO3-2:
i)Cu+2 + CO3-2—->
ii)Hg+2 + CO3-2—->

A

i)Cu+2 + CO3-2—->CuCO3.Cu(OH)2
ii)Hg+2 + CO3-2—->HgCO3.HgO[Hg(OH)2—->HgO]

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9
Q

CO3-2:
8)CO3-2 and HCO3—Ca+2—->
after filteration:
9)Ca(HCO3)2—Δ—->
10)Ca(HCO3)2—NH3—->

A

8)CO3-2 and HCO3—Ca+2—->CaCO3+Ca(HCO3)2(aq)
after filteration:
9)Ca(HCO3)2—Δ—->CaCO3+H2O+CO2
10)Ca(HCO3)2—NH3—->CaCO3+NH4+

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10
Q

SO3-2:
i)SO3-2—H+—->
ii)Ca(OH)2—-> —SO2—->
iii)K2Cr2O7/H+ + SO2—->

A

i)SO3-2—H+—->SO2+H2O
ii)Ca(OH)2—SO2—>CaSO3—>Ca(HSO3)2
iii)K2Cr2O7/H+ + SO2—->Cr+3 + SO4-2

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11
Q

SO3-2:
iv)starch + iodate(IO3-) paper + SO2—->

A

iv)starch + iodate(IO3-) paper + SO2—->SO4-2 +I2-starch(blue)

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12
Q

SO3-2:
iv)starch + iodate(IO3-) paper + SO2—->
v)SO3-2+Ba+2—->BaSO3—O2—->
—H2O2—->
—Br2+H2O—->
—dil. HNO3—->

A

iv)starch + iodate(IO3-) paper + SO2—->SO4-2 + I2-starch(blue)
v)SO3-2+Ba+2—->BaSO3—O2—->BaSO4
—H2O2—->BaSO4+H2O
—Br2+H2O—->BaSO4+Br-
—dil. HNO3—->BaSO4+NO

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13
Q

SO3-2:
vi)Ag+ + SO3-2—-> —SO3-2—->
—boil—->
vii)KMnO4/H+ + SO3-2—->

A

vi)Ag+ + SO3-2—->Ag2SO3—SO3-2—->[AgSO3]-(soluble)
—boil—->Ag+SO4-2

vii)KMnO4/H+ + SO3-2—->Mn+2 + SO4-2

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14
Q

S-2:
i)Al2S3 and Cr2S3—H2O—->
ii)(CH3COOH)2Pb+H2S—>
iii)KMnO4/H+ + H2S—>
iv)K2Cr2O7/H+ + H2S—>

A

i)Al2S3 and Cr2S3—H2O—->Al(OH)3 and Cr(OH)3
ii)(CH3COOH)2Pb+H2S—>PbS
iii)KMnO4/H+ + H2S—>Mn+2 + S
iv)K2Cr2O7/H+ + H2S—>Cr+3 + S

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15
Q

S-2:
6)test by sodium nitroprusside
Na2Fe(CN)5NOS—S-2—->
7)Methylene blue test

A

6)
Na2Fe(CN)5NOS—S-2—->Na4[Fe(CN)5NOS]

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16
Q

NO2-:
i)NO2—H+—-> —-> —O2—->
ii)KMnO4/H+ + NO2- —->
iii)IO3- + NO2- —>
iv)I- + NO2- —>
v)Br2 + NO2- —->
vi)Fe+2 + NO2- —->
vii)O3 + NO2- —->

A

i)NO2—H+—->HNO2—->H2O+HNO3+NO—O2—->NO2
ii)KMnO4/H+ + NO2- —->Mn+2 + NO3-
iii)IO3- + NO2- —>I2 + NO3-
iv)I- + NO2- —>I2 + NO
v)Br2 + NO2- —->Br- + NO3-
vi)Fe+2 + NO2- —->Fe+3 + NO
vii)O3 + NO2- —->O2 + NO3-

17
Q

NO2- + N(-3) :
i)NaNO2 + NH4Cl—>
ii)HNO2 + RNH2—->
iii)HNO2 + HSO3-NH2—->
iv)2HNO2 + NH2-CO-NH2—->
v)HNO2 + NH2-CS-NH2—->NHCS + N2 + 2H2O

A

i)NaNO2 + NH4Cl—>NaCl + N2 + 2H2O
ii)HNO2 + RNH2—->R-OH + N2 + H2O
iii)HNO2 + HSO3-NH2—->H2SO4 + N2 + H2O
iv)2HNO2 + NH2-CO-NH2—->CO2 + 2N2 + 3H2O
v)HNO2 + NH2-CS-NH2—->NHCS + N2 + 2H2O