Heating Effect - Notes

JHeating effect\1Heating of metal Carbonatesmetal Carbonatesm. oxides + CO2(except Na, K,Rb,cs)Low Q orLow P. powerCao + co2ItCaco3Beo + Co2Beco3mgco3mgo + CO2tiz(O3Li20 CO2Philosopheris woul2no + CO2Znozno2nco3coldnotPbCo3Pbo+ CO2(yellow)(white)(yellow)iscuco3cuo + CO2Red(Black) Awe+1/202920culor}.cuco3cuot the +CO2CH20 + 11202Na2CO3xK2CO3xdirectly meltxRb,CO3*Ag, 00Ag20 + CO2Heavy(yellowish white)Ag + 11202metals(Black)havelesstoHgCO,te g + co2affinityHg+1/2°2 +for oz2 Heating of metal nitrates1>metal nitratem.oxide+ NO2+ 02(A)except(Na, K, Rb,cs) Ca(No3)21) Cao + NO2+O2mg CN03'21>>mgo +Be(M03)2D3Bec + NO2+O22n(N03)213zno + NO2+O2pb(No3)213pbo + NO2+O2cu ( N o ) 2cuo + NO2+O2ULi.NO3Li20 + NO2+O2aAg NO3Ago + NO2+O21)-)As+1/2i2Hg NO3Hgo + NO2+ 02AS + 1202as which salt gives Reddish brown gas onheating?Q) which gives two para magnetic gasesas which salt directly give metal on neating[ Three oxides are unstable pbo2, AS20, Hgo]D(B) minitratesMnitrite +02(Na, K,Rb,cs)800 c, Na2 + N2 + 02Na No3 500°C &NaNO2 + 02as which salt under goes partial decompositionas As which salt on decomposition gives both diamagnetic(Na, K, Rb, CS nitrates)& paramagnetic gasesAust Na, K, Rb, (s nitrates 3]Heating of metal hydroxides3Ametal hydroxidemetal oxidet H2O(except Na,K,Rb,cs)sKOHXCaustic PotashDNaoHXCaustic.Sodaisca(oH)2Cao + H2Oslaked limequick time.mg(OH)2 mgo + H2OA1(CH) A1203 + H2O2n COH) D 2no + H2OFe(OH)2 is Feo + H2ODirty green1>pb(oH),Pbo + th2chasky whiteyellowcu (0H)2wor H2Oblueblackisrgo + H2O*HgcotizHg + 1/202ZAJOHAjot H2O&AS + 1/2°241Thermal stability of metal sulphatesDmetal oxide + so3metal sulphates(except Na, k, Rb,es)1)esIZnso 7th20znson2no+ SO3+7800Cwhite vitriol(anlya)SO2+1/202750°A1,cuso,2cuso 5H.Ocuo + SO3100°C220°C7800 "(blue vitriol)SO2+1/2O2 120°C3:- asoy.2H2Ocasoci 1/2 /20caso200°cgypsumP.O.P800°Ccao + SO2+1/2°2is4:- Fesou 7H20Fesou H2ODFesonFe203 + SO2+ so3Feo + so3shistFe2O3SO2It happens only in Feson ca+2 cut? 2n+2 don'tfurther oxidise.as which sact on heating gives both SO2 $ SO3 , ?Ans Fesor.7thois3Fe2(sou'sFc2O3 + SO3():- Thermal stability of metal chloridesculoridesanhydroushydrousFAnhydrous chloridesis\Fec'sFecl2 + c'21>2pbcluPbcl2+ cl2D3Hgcl2Hg,"2 + Cl24 pclsispc'3+ cl2 Generally anions gives gas5Co3co2so-2-SO3Cationic radicals gives ppt (solid part )In above case CI cig, e is gained bycentral atom which should be present in higher0.5 so it can easily accept e-BY Hydrated chloridest1>Ca Cl2. 6H20cac12+ 6th20No hydrolysisLowd1)Bacl2 6 H2OBac's + 6420DAIC'3 6H2OAI(OH)3 1, Al203 + H2OHighUdmgcb.6tzomg(or) 12 mg + H2OhydrolysisdehydrationDFe2O3 i HCIT H2O+2Dcocl2coclz. 6H20(pink)(blue colour)6:- Heating effect of ammonium salts/Ammonium Saltyoxiweak NonN- containgStrongoxidisinganionaniononion (a) Ammonium salts which contains anions havingpoor oxioising chrea cterC co:22, souz, my CT, Br, I 13.0-3 PO 5-2,HCO3, CH.COO >NHUCINH3 + He I(NHu),CO3NH3+ H2003H20+CO2(NHW)2SNH3+H2SNH CNNH + HCN(NH4)2S04NH3+ issuy(NH4)2PO4NH's+ H3PO4"B1 Amnonium salts which contains anions havinghaving strong oxi ChrontsC clou I03, croal 29. mnowDN2st 4H2O- C2203r(NH412027D2(NHulmnouN2+ 2H2° + mno2D3NHyIO3Nick + I2+ O2 + the4isNH4 C104,NH + Cl2 + O2 + H2O2(c) Ammowum salts which contains anions havingnitrogen atom1>NHUNOZN2 + H2ONHy NO3 sN20+ H2ON2+ 11202A( An above case cationic part give gases.Generally anionic part give gases) 77Heating effect of HCO3, HCOO", , CH3000 20salts.metal (x)Dm. carbonates - YX =)(HCO3 3, - HCOO , cycool, C20u2)y=) x CO32IX- HCO3 [ don't depends upon $]y 2HCO3 - - CO3 => H2O + CO2g' NaHCO3isNa2CO3 + CO2+ H2OCH HCO3Dcaco3+ cost H2O2X= Gouy= C2052 - cozzCODm. carbonate + com. oxalateeg:- cac20u Dy caco3 +coTCao + CO2Bec2°u D Beco3+ concao + Co2DPbc204PbCO3 + conPbo + co2Ag,C204 D AS 20 + co2+ cohrAs + 11202Hg c20415Hgco3+9 coHgo + CO2+COHg + 1/202m. oxalatesm. carbonates + co + coztc( Na, K, R b, (s) 3f X= HCOOy 24coo- - CO32HCHOm formate1 ,m. carbonate + HCHOexceptionHCOO NaDNa2C2°u + H2T350°C(Na, K,RD,CS,eg. (HC00)2CDCaco3 + HCHO1)Aes HCOOASAS2CO3 + HCHOAS20+ cont HCHOAS + co2+ HCOOG1)* eg: (HCOO) 2 HgHgco3 + HCHOHg+ CO2 HC00H4 :- x=>cycoo 4=x - CO32)CHJCOCH3miacetatesCHSOCH3 + m.carbonatises:- CHCOOASAS2CO3isPbo + CO2+esisCao + CO2 f CH COCH3eg:Deg. CH3COO NoNa2CO3+ CHICOCH,eg. mg(OAC)21)mg o+ CO2+ CH,COCK,es:- Be (OAC)21Beot CO2+ CH2COCH,D,es CH3COOKK2CO2+ cyclock ::Heating effect of prosphate salts9(i) 10. PhosphatemetaphosphatH3POUremove (H+10 phosphateANa PO3 + H2ONaH2PO42° phosphate10 phosphate - remove 1Ht'ii)D2Na2H poytho + NauP2072° phosphatepyrophosphate.'iiii 3° phosphate2° phosphate - remove 1 H +3° phosphateXANazpouNo effectNote In phosphatesevenno of acidic H=oddno of acidic H-Dex:- Na(NHu)HPO4 - 4H20Na(NHu)Heoy(microcosmic salt)I.s(even)NH3 + H2O + NaPO3Aext 2mg (NHU) PO42NH3 + HHO + mg,P207(odd)aofHeating effect of Permanganatef +2+7513 KK2mno4 +6 + mno2+ 022 kmnoy(green) Brown.dark purple(almostblack) 10] Heating effect of dichromat $ salt2K20220223 2K2crou + O2oforange(green) yellow"j Heating effects of oxo acids'A' Having max oxi. state acidsdehydrate.es's H2CO3 d H2O+CO2eg: H2SO4 443K SO3+ H2OSO2+1/2027800°Cesl 2HC104 1) C1207+ H2Oes:- 2HNO,1),N205+ H2OLA, 2NO2T 1/20211>eg:- H3PO4HupaozHPO3aP2OSHPO3Hu 2207P205eg:- Husions,H6 Siz071), H2SiO3 D, sio2H2SiO3sio2H6 Siz07DD.1), HBO2H2B407B2O3'eg:- H3BO3H4 32°S IHBO2Xy- (H2OX2>H2B OF-H2OB2O3 2) Heating of acid having less than max."oxidation stateDL maxosjust higher oxidationstate ( ic acid)+Low oxi . state Product.es:- H3PO3isH3PO4 + PH3H3PO21), H3PO4 + PH3HC10 12, HC103 + HCIHCIO212HCIO3 + HCIHCIO312,HC104 + Heicio2 + H2OHNO2 Dr HNO3 + NO - H2O+CO2H2C2041>H2CO3 + covH2SO313,H2SO4 + S +++2012JHeating effect of oxidess300°CDAS 0As - 1602IsisHgoHgoteg + 11202Red4000yellow1)Pbo2pbog+o2.crosB C22O3+ 02cro3G203+02mino2mnz°a o2DI205I2+ 1202pb304Pbo + 2K2OK2O(white)(yellow)