Heating Effects (12th&13th)
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Transcript of Heating Effects (12th&13th)
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7/25/2019 Heating Effects (12th&13th)
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HEATING EFFECTS
XII(ABCD) & XIII(XYZ)
BANSALCLASSES TARGET IIT JEE 2007
INORGANICCHEMISTRY
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Bansal Classes Heating Effects [2]
HEATING EFFECTS
Heating effect of carbonate & bicarbonate salts
All carbonates except (Na, K, Rb, Cs) decompose on heating giving CO2
Li2CO
3Li
2O + CO
2
MCO3MO + CO
2[M = Be, Mg, Ca, Sr, Ba]
Yellow 32
COAg Black
Ag2 + CO2+
2
1O
2
carbonate)II(CuBasic
32CuCO.)OH(Cu
2CuO + CO2+ H
2O
white3
ZnCO
)cold(white)hot(Yellow
ZnO + CO2
PbCO3
YellowPbO + CO
2
White
OHCOCOOPb)OH(Pb.PbCO22243
C450
23
HgCO3Hg + 2
1
O2+ CO2
(NH4)2CO
32NH
3+ H
2O + CO
2
All bicarbonates decompose to give carbonates and CO2. eg.
2NaHCO3
Na
2CO
3+ CO
2+ H
2O
[General reaction 3
HCO2 23
CO +H2O + CO
2]
Heating effect of ammonium salts
(NH4)2Cr
2O
7N
2+ Cr
2O
3+ 4H
2O
NH4NO
2N
2+ 2H
2O
NH4NO3N2O + 2H2O2NH4
ClO4N
2+ Cl
2+ 2O
2+ 4H
2O
2NH4IO
3N
2+ I
2+ O
2+ 4H
2O
[If anionic part is oxdising in nature, then N2will be the product (some times N
2O).]
(NH4)2HPO
4HPO
3+ H
2O + 2NH
3
(NH4)2SO
4NH
3+ H
2SO
4
2(NH3)3PO
42NH
3+ P
2O
5+ 3H
2O
(NH4)2CO
32NH
3+ H
2O + CO
2
[If anionic part weakly oxidising or non oxidising in nature then NH3will be the product.]
Heating effect of nitrate salts
MNO3KNO2+ 2
1 O2
[M = Na, K, Rb, Cs]
2LiNO3Li
2O + 2NO
2+
2
1O
2
2M(NO3)22MO + 4NO
2+ O
2
[M = all bivalent metals eg. Zn+2, Mg+2, Sr+2, Ca+2, Ba+2, Cu+2, Pb+2]
Hg(NO3)2Hg + 2NO
2+ O
2; 2AgNO
32Ag + 2NO
2+ O
2
Heating effect of Halides salts
2FeCl3 2FeCl
2+ Cl
2; AuCl
3AuCl + Cl
2
Hg2Cl2HgCl2+ Hg ; NH4ClNH3+ HClPb(SCN)4 Pb(SCN)
2+ (SCN)
2
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Bansal Classes Heating Effects [3]
PbCl4 PbCl
2+ Cl
2[PbBr
2 PbBr
2+ Br
2& PbI
4does not exists]
Heating effect of hydrated chloride salts
MgCl2. 6H
2O
MgO + 2HCl + 5H2O
2FeCl3. 6H
2OFe
2O
3+ 6HCl + 9H
2O
2AlCl3. 6H
2OAl
2O
3+ 6HCl + 9H
2O
Pink OH2
C50
222OH6.CoCl
Pink OH2C58
222
OH4.CoCl
violetdRe OH2C140
222
OH2.CoCl
Blue 2CoCl
Heating effect of hydrated Sulphate salts
vitriolBlue
OH5.CuSO24
OH4
C100
2
WhiteBluish
OH.CuSO24
OH
C220
2
White
4CuSO
C800CuO + SO
2+
2
1O
2
BlackCuO + SO3
VitriolGreen
OH7.FeSO24 OH7
C300
2
FeSO4
Fe2SO
3+ SO
2+ SO
3(very important)
Fe2(SO
4)3
Fe2O
3+ 3SO
3
saltepsom OH7.MgSO 24 OH7 2
MgSO4 [Same as ZnSO4]
gypsum
OH2.CaSO24
C120 (CaSO4.2
1H
2O) +1
2
1H
2O
Plaster of pairs
OH2.CaSO24
burntDead
4CaSO +
2
1H
2O
Na2S
2O
3.5H
2O
C220Na
2S
2O
3 + 5H
2O
3Na2SO4+ Na2S5.ZnSO
4.7H
2O
C70 ZnSO4.6H
2O
C20070 ZnSO4.H
2O
C200 ZnSO4
ZnO + SO2+
2
1O
2
2NaHSO3
2NaHSO4
Na2SO
4+ H
2O + SO
3
Heating effect of Oxide salts
2Ag2O
C300
4Ag + O2
;yellowHgO
C400
red
HgOheatingstrong Hg +
21 O
2
PbO2
PbO +
2
1O
2;
leadRed43
OPb Litharge
PbO6 + O2
3MnO2
C900 Mn3O
4+ O
2;
white
ZnO
yellow
ZnO
2CrO5Cr
2O
3+
2
1O
2;
yellow
PbO
Red
PbO
(Massicot) (Litharge)2CrO
3
C420 Cr2O
3+
2
3O
2; I
2O
5I
2+
2
5O
2
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Bansal Classes Heating Effects [4]
Heating effect of dichromate & chromate salts
(NH4)2Cr
2O
7
N2+ Cr
2O
3+ 4H
2O
K2Cr
2O
7
2K2CrO
4+ Cr
2O
3+
2
7O
2
Heating effect of phosphate salts
NaH2PO
4
H
2O + NaPO
3
1 phosphate salt
Na2HPO
4
H2O + Na
2P
2O
72 phosphate salt
Na3PO
4 No effect
3 phosphate salt
Na(NH4)HPO
4.4H
2O
OH4 2
NaNH4HPO
4
.tempHigh NaPO
3+ NH
3+ H
2O
2Mg(NH4)PO
4
Mg2P
2O
7+ 2NH
3+ H
2O
Heating effect of Acids
2HNO3
H2O + 2NO2+ 2
1
O2
H2SO
4
C444H
2O + SO
3
H2SO
4 C800 H2O + SO2+ 2
1O
2
3H2SO
3 2H
2SO
4+ S+ H
2O
3HNO2 HNO
3+ 2NO + H
2O
HClO3 HClO
4+ ClO
2+ H
2O
3HOCl 2HCl +HClO3
4H3PO
3
C200
3H3PO
4+ PH
3
2H3PO
2H
3PO
4+ PH
3
2NaH2PO
2Na
2HPO
4+ PH
3
H3PO
4
C220 H4P
2O
7
C320 4HPO3
C320 2P2O
5+ 2H
2O
H3BO
3
C100 4HBO2
C140 H2B
4O
7
hot
dRe 2B2O
3+ H
2O
H2C
2O
4 H
2O + CO + CO
2
Heating effects of acetate, formate, oxalate salts
CH3CO2K
K2CO3 + CH3COCH3 Na2C2O4Na2CO3+ COPb(OAc)
2
PbO + CO2+ CH
3COCH
3SnC
2O
4
SnO + CO2+ CO
Mg(OAc)2MgO + CO
2+ CH
3COCH
3FeC
2O
4FeO + CO + CO
2
Be(OAc)2BeO + CO2+ CH3COCH3 Ag2C2O4
2Ag + 2CO2
Ca(OAc)2CaCO
3+ CH
3COCH
3HgC
2O
4Hg + 2CO
2
Ba(OAc)2BaCO
3+ CH
3COCH
3
HCO2Na
C350 Na2C
2O
4+ H
2
2HCOOAg HCOOH + 2Ag + CO
2
(HCOO)2HgHCOOH + Hg + CO
2