Iisirinji ezilahlwayo -Isihlomelo soku-1
Ukulungiswa kwesisombululo se-ethylene oxide eseleyo
I-0.1mol / L i-hydrochloric acid: nciphisa i-9ml i-hydrochloric acid ukuya kwi-1000ml.
I-0.5% isisombululo sexesha: ubunzima be-0.5g ye-periodation kwaye ihlambulule kwi-100ml.
Isisombululo se-sodium thiosulfate: umlinganiselo we-1g ye-sodium thiosulfate kwaye uhlambulule kwi-100ml.
I-10% isisombululo se-sodium sulfite: ubunzima be-10. 0g i-anhydrous sodium sulfite, yinyibilikise kwaye uyihlambulule kwi-100ml.
Isisombululo sovavanyo lwe-Magenta sulfurous acid: linganisa i-0.1g ye-fuchsin esisiseko kwaye wongeze i-120ml yamanzi ashushu ukuyinyibilikisa.Emva kokupholisa, yongeza i-20ml ye-10% isisombululo se-sodium sulfite kunye ne-2ml ye-hydrochloric acid ebumnyameni.Isisombululo sovavanyo kufuneka singabi mbala.Ukuba ifunyenwe ibomvu, kufuneka ilungiswe kwakhona.
I-Ethylene glycol isisombululo se-stock standard: thatha i-flask yangaphandle eyomileyo kwaye ucoce i-50ml ye-volumetric flask, yongeza malunga ne-30ml yamanzi, ulinganise ngokuchanekileyo, uthathe i-0.5ml ethylene glycol, uyifake ngokukhawuleza kwibhotile, uyihlube, uyilinganise, umehluko phakathi Ubunzima obubini bubunzima obuqulethwe kwisisombululo, yongeza amanzi kwisikali, udibanise, kwaye ubale ukugxininiswa kwayo ngokwefomula ilandelayo:
C＝W/50 × iwaka elinye
C: Glycol umgangatho wesisombululo sesitokhwe soxinaniso g/l;
W: Ubunzima be-ethylene glycol kwisisombululo g
Isisombululo esiqhelekileyo se-Ethylene glycol: ngokuchanekileyo thatha i-1.0ml yesisombululo esiqhelekileyo sesitokhwe, kwaye uhlambulule kwi-1000ml ngamanzi.
Ukulungiswa kwe-reagent elula ene-oxidized:
a.Nciphisa i-asidi ye-sulfuric (20%): Thatha i-H2SO4128ml, ngokucotha i-500mL, kwaye udibanise kwi-1000mL emva kokupholisa.
b.Isalathisi sesitatshi: thatha i-0.5g yesitatshi esinyibilikayo, yinyibilikise kwi-100ml yamanzi, yitshise kwaye uyibilise, kwaye emva koko uyipholise ngokulinda (iya kulungiswa ngokutsha xa isetyenziswa okwethutyana)
c.Isisombululo sePotassium permanganate: thatha i-3.3gKMnO4, yongeza i-1050ml yamanzi, ubilise i-15min, yongeza amanzi kwi-1050ml, uyiyeke ukuba ime ngaphezu kweentsuku ezimbini emva kokutywinwa, ihluze ngefunnel yeglasi encinci, yivuthulule, kwaye ulungelelanise ukugxila kwayo.
Ukulinganisa: Thatha i-0.25g yereferensi ye-sodium oxalate eyomileyo kwisisindo esiqhubekayo kwi-1050C, yilinganise ngokuchanekileyo, yongeza i-100ml yesisombululo se-sulfuric acid (8 + 92) kwaye ugxobhoze ukuyichitha.Yongeza ngokukhawuleza i-25ml yesisombululo esiqhelekileyo se-KMnO4 ukuba ilinganiswe kwisisombululo esivela kwi-buret.Emva kokuphela, yifudumeze ukuya kwi-650C kwaye uqhubeke uhambisa i-titrating de isisombululo sijike sibe bomvu kwaye sihlale singatshintshi kwi-30s.Kwinqanaba lokugqibela le-titration, ukushisa kwesisombululo akuyi kuba ngaphantsi kwe-550C, kwaye uvavanyo olungenanto luya kuqhutywa ngexesha elifanayo.Yonke i-6.7mg ye-sodium oxalate ilingana ne-1ml ye-0.02mol / L KMnO4 isisombululo esiqhelekileyo.Ukuxinwa kwangempela kwesi sisombululo kubalwa ngokusetyenziswa kwesi sisombululo kunye nesixa se-sodium oxalate ethathiweyo.
d.C (KMnO4)=0.002 mol/L: Thatha i-0.02 mol/L KMnO4 kwaye wongeze amanzi ukuwaxuba amaxesha ali-10 ngaphambi kokusetyenziswa
e.Isodium thiosulfate (0.1 mol/L): bunzima 26g Na2S2O3.5H2O okanye 16g anhydrous Na2S2O3, yongeza i-0.2g anhydrous sodium carbonate, yinyibilikise emanzini ayi-1000ml, yibilise kancinane i-10min, yipholise, yongeza amanzi amabini emva kwe-10. iiveki, kwaye ulungelelanise ukugxila kwayo.
Ulungelelwaniso: bunzima i-0.18g yereferensi ye-potassium dichromate yomiswe kwi-1200C ukuya kubunzima obuqhubekayo.Nika umlinganiselo ngokuchanekileyo.Yifake kwi-flask yokulinganisa iodine, yinyibilikise kwi-25ml yamanzi, yongeza i-2g ye-potassium iodide kunye ne-20ml ye-dilute sulfuric acid (20%), xubha kakuhle, uyibeke kwindawo emnyama ye-10min, yongeza i-150ml yamanzi, i-titrate it. kunye nesisombululo se-Na2S2O3 esilungisiweyo [c (Na2S2O3) ＝ 0.1 mol / L], yongeza i-2ml yesisombululo sesalathisi sesitatshi (10g / L) ekupheleni, qhubeka u-titrating de isisombululo sitshintshe ukusuka eluhlaza okwesibhakabhaka ukuya kuluhlaza oqaqambileyo, kwaye uqhube uvavanyo olungenanto kwangelo xesha.Yonke i-1ml ye-Na2S2O3 (0.1 mol / L) ilingana ne-4.9031mg ye-potassium dichromate.Ukugxininiswa kwesi sisombululo kubalwa ngokusetyenziswa kwesi sisombululo kunye nesixa se-potassium dichromate esithathiweyo.
f.C (Na2S2O3) ＝ 0.01 mol/L: dilute 0.1 mol/L Na2S2O3 ngamanzi asandul’ ukubiliswa napholileyo phambi kokuma ngamaxesha ali-10.
Ixesha lokuposa: Oct-04-2022
