IBANSALCLASSES ^
TARGET IIT JEE 2007
INORGANIC CHEMISTRY ^I I ( A BC D)
& XII I(XY Z)
HEATING EFFECTS
HEATING
EFFECTS
Heating effect of carbonate & bicarbonate salts All All carbonates except (Na, K, Rb, Cs) decompose on heating giving giving C 0 2 Li 2C0 3 > Li 2 0 + C0 2 MC 0 3 » MO + C0 2 [M = Be, Mg, Ca, Sr, Ba] 1 Ag 2 C0 3 > 2Ag + C0 2 + - 0 2 Blao k
Yellow
2
CU(0H)2.CUC03
A
2CuO + C0 2 + 1 ^ 0
)
Basic Cu(II) carbonate
ZnC0 3
> ZnO
white
+ C0 2
Yellow(hot) white(cold)
P b C 0 3 — > Pb0 Pb 0
C0 2
+
1
HgC03
2PbC0 3 .Pb(0H) 2
450°C
> P b 3 0 4 +C 0 + C0 2 + H 2 0
White
*
» Hg + - 0 2 t + C0 2
(NH 4)2C0 3
» 2NH3 + H 2 0 + C0 2
All All bicarbonates bicarbonates decompose to t o give carbonates and and C0 2 . eg. 2NaHC0 3 — > N a 2 C 0 3 + C0 2 + H 2 0 [Gen [Gener eral al reaction reaction 2 H C 0 :
> C0 3 ~+ H 2 0 + C0 2 ]
Heating effect of ammonium salts (NH 4)2Cr 207 » N2 + Cr C r 20 3 + 4H 2 0 NH 4 N0 2 > N2 + 2H 2 0 NH 4 N0 3 — N 2 0 + 2 ^ 0 2NH4 C10 C104 > N2 + Cl2 + 20 202 + 4 ^ 0 2NH4 I 0 3 » N2 + I2 + 0 2 + 4 ^ 0 [If [If anionic anionic part is oxdising oxdising in nature, then N2 will will be the product (some times N20).] (NH 4)2HP0 4 » HP0 3 + ^ O + 2NH3 (NH4)2so4 — * n h 3 + H2SO4 2(NH 3)3P0 4 > 2NH3 + P 2 0 5 + 31^0 (NH (N H4 j 2 C0 3 » 2NH3 + ^ O + C0 2 [If [If anionic anionic part wealdy oxidising or no or non n oxidising in nature then NH3 will be the product.] Heating effect of nitra ni trate te salts 1 MNO3 — » KN KNO2 + - o 2 [M
= Na, K; Rb, Cs] 2LiN03
1 » Li 2 0 + 2N0 2 + - 0 2
2M(N0 3)2 > 2M0 + 4N0 2 + 0 2 [M= [M = all all bivalent bivalent metals eg. eg. Zn+2, Mg+2, Sr +2, Ca+2, Ba+2, Cu+2, Pb+2] Hg(N03) 2 ; 2AgN0 3 >2Ag + 2N0 2 + 0 2 > Hg + 2N0 2 + 0 2 Heating effect of Halides salts 2FeCl3 > 2FeCl2 + Cl2 ; Hg2C^ > HgCl2 + Hg ; Pb(SCN)4 > Pb(SCN)2 + (SCN)2 fe Bansal Classes
AUC13
NH4C1
Heating Effects
> AuCl + Cl2 > NH3 + HCl
[2]
PbCl4 > PbCl2 + Cl2 [PbBr 2 » PbBr 2 + Br 2 & Pbl4 does not exists] exists] Heating effect ofhydrated chloride salts MgCl2 . 6 ^ 0 — M g O + 2HC1 + 5 ^ 0 2FeCl 3. 6H 2 0 > Fe 2 0 3 + 6HC1 + 9H 2 0 2A1C13. 6H 6 H20 > AL203 + 6HC1 + 9H20 50 C
COC COC12.6H20
°
COC COC12.4H20
>
Pink
2
Pink
58 c
°
"2H20
Heating effect of hydrated Sulphate salts C uS u„ ,S O4.. SH SH .2O - i 2 9 ^ - C u S 0 , . H , 0 -4H20
Blue vitriol
22
R J v i o l e t
C
°°
-H2O
Bluish White
140 c
> CoCL.2H,0
°
2
> CoCL Blue 2
-2H20
> CuS0 4
>C u 0
+ s o
i
+
Q
White
I 7S0°C_ C u O + S O ,
300°C
FeS0..7H 9 0 4 2 Green Vitriol
2
Fe 2(S0 4)3
O
Black
-Ff -F f 2 S0 3 + S0 2 + S0 S 0 3 (very important)
>FeSO,
>Fe„0, + 3 SO,
MgS0 4 .7 H 2 0 —^-^MgS0 44 I L[Same [Same as ZnS0 Zn S044 J] epsom salt salt
-7H20
°
1 1 ) (CaS0 4 .~ H ^ O) + 1 - ^ 0 Plaster of pairs
120 c
CaS044 .2H.0 2
°
gypsum
+ 1j H
2
0
.
CaS0 4 .2 H 2 0
1 CaS0 4 + 2 H 20 Dead burnt
220°C
Na 2S 2 0 3.5H .5 H 2 0
^•Na2S203 + 5 ^ 0 '
70 c
ZnS0 4 .7H .7 H 2 0
°
(Fro (From m 4 mole moles) s) * 3 N a
.6 H 2 0 > ZnS0 4 .6H
70°-200°c
2
S0
)
+
4
N a ^ .
ZnSP 4 H2Q
>2QQ°c
> ZnSP 4 IA
| ^ > Na 2 S 2 0 5 + H 2 0
2NaHS0 3 A
2NaHS04
*Na 2 S0 3 + S 0 2 i *Na 2 S + Na 2 S0 4
>800°C
^ 1 ZnO + SO, SO2, + - O,2 2
>Na 2S0 4 + ^ O + S0 3
Heating effect of Oxide salts 2Ag 20 PbO. -
>4Ag + 300°C
A
0
2
HgO
A
yellow
400°C
Pb 3 0 4
->Pb ->PbO O+ -02
Red lead
3Mn02
900°c
2CrO,
> Cr 2 0 3 + 7 0 ,
>
Mn 3 04 + 0 2
ZnO white
c
6 p b o + Q ?
340^
Lith Lithar arge ge
Hot Cold
fe Bansal Classes
420 c
°
>
^ ZnO
pb o y e ll o w ^ C o l d
Cr 2 0 3 + - 0 2
2
red
^70^
(Massicot) 2Cr0 3
>Hg0^Hg+-0
/ellow yellow
^ PbO Red (Litharge)
I 205
Heating Effects
[3]
Heating effect of dichromate dichroma te & chromate salts A
(NH 4)2Cr 207
>N2 + Cr 2 0 3 + 4H 4 H 20
^ 2 K 2 C r 0 4 + Cr 2 0 3 + - 0 2
K 2 Cr 20 7
Heating effect of phosphat e salts *->H 2 0 + NaPOs NaH 2P0 4 1° phospha te salt
Na2HP04 .
^ O
+ Na2P207
2" phosphate salt
Na 3P0 4
A ^ No effect effect
3° phosphate salt
»NaNH4HP0 4
Na(NH Na(N H4)HP0 4.4H 20 2Mg(NH4)P04
A
High temp.
-4H20
> NaPO-.
+ NH3 + H 2 0
> Mg2P207 + 2NH3 + H 2 0
Heating effect of Acids Acids ->H 2 0 + 2N 0 2 + - 0 2
2HN0 3 H2SO4
444° C
^H 2 O
+ so3
H2so4 - >800°C >H 2O + SO2 + - O 2 3H 2S0 3 —» —» 2H2SU4 + s l + H2O 3HN0 2 - —» H N 0 3 + 2NO + H 2 0 HC10-,— -> HC10 4 + C10 2 + H 2 O 3HOC1 —-> 2HC1+HC10, 4H 3 P0 3
>3H,P0
+ PH.
Undergoes dispropor-tionation reaction
200°C 3 44 3 2H 3 P0 2 — H 3 P O 4 + P H 3 2NaH2P0 2 » Na2HP04 + PH3 220°C > u4 p 2 O7 320°C ^4HP0 3 H3PO4 n
H3BO3
100°C
H2C2o4 _ ^ H
)4
2
r
rrq2
!40°C
>320°c ) 2 P 2 0 . + 2 ^ 0 Re d
• H2 B4 07
hot
->2B203- H2O
o + CO + c o 2
Heating effects of of acetate, formate, format e, oxalate salts - * K 2 C O 3 + C H 3 C O C H ,
Pb(OAc)2 .
^ P B O + C 0 2 + CH3COCH3
SnC 204
Mg(OAc)2-
-» MgO + C0 2 + CH3COCH3
FeC 2 04
Be(OAc), -
BeO + C0 2 + CH3COCH3 Ca(OAc)2 - -> CaC0 Ca C0 3 + CH3COCH3 Ba C0 3 + CH3COCH3 Ba(OAc)" - -> BaC0 N a 2 C 2 0 4 + H J HC0 2 Na _ 35Q°c ) Na
fe Bansal
Na2C 204
CH 3 C0 2 K-
2H C0 0 Ag
HCOOH HCOOH + 2Ag 2Ag + C0 2
(HCOO),Hg
> HCOOH + Hg + C0 2
Classes
Heating Effects
Ag 2 C2 04 HgC204-
> Na 2 C0 3 + CO . SnO + CO, + CO -» FeO + CO + CO, . 2Ag + 2C0 2 -» Hg + 2C0 2
[4]
