izindlela zokuhlola
Igama lendlela: i-hypromellose—ukunqunywa kweqembu le-hydroxypropoxy—ukunqunywa kweqembu le-hydroxypropoxy
Ububanzi bokusetshenziswa: Le ndlela isebenzisa indlela yokunquma i-hydroxypropoxy ukuthola okuqukethwe yi-hydroxypropoxy ku-hypromellose. Le ndlela iyasebenza ku-hypromellose.
Isimiso sendlela:Balaokuqukethwe kwe-hydroxypropoxy kumkhiqizo wokuhlola ngokwendlela yokunquma i-hydroxypropoxy.
I-Reagent:
Isixazululo se-chromium trioxide esingu-1.30% (g/g)
2. I-Hydroxide
3. Isixazululo sesibonakaliso se-Phenolphthalein
4. I-sodium bicarbonate
5. Nciphisa i-sulfuric acid
6. I-potassium iodide
7. Isixazululo se-sodium thiosulfate titration (0.02mol/L)
8. Isixazululo sesibonakaliso sesitashi
imishini:
Ukulungiselela isampula:
1. Isixazululo se-sodium hydroxide titration (0.02mol/L)
Ukulungiselela: Thatha isixazululo se-sodium hydroxide esicacile esingu-5.6mL, engeza amanzi abandayo abilisiwe ukuze kube ngu-1000mL.
Ukulinganisa: Thatha cishe amagremu angu-6 e-potassium hydrogen phthalate ejwayelekile eyomisiwe ku-105°C ukuze ibe nesisindo esifanayo, uyilinganise kahle, engeza ama-50mL wamanzi abandayo abilisiwe, shukumisa ukuze incibilike ngangokunokwenzeka; engeza amaconsi amabili esisombululo se-phenolphthalein indicator, sebenzisa lesi sithiyo se-Liquid, uma usondela ekugcineni, i-potassium hydrogen phthalate kufanele incibilike ngokuphelele, bese incibilika kuze kube yilapho isixazululo siba pinki. Isixazululo ngasinye se-1mL sesisombululo se-sodium hydroxide titration (1mol/L) silingana no-20.42mg we-potassium hydrogen phthalate. Bala ukuhlushwa kwalesi sixazululo ngokusekelwe ekusetshenzisweni kwalesi sixazululo kanye nenani le-potassium hydrogen phthalate elithathiwe. Nciphisa ngobuningi izikhathi ezi-5 ukuze wenze ukuhlushwa kube ngu-0.02mol/L.
Indawo Yokugcina: Yifake ebhodleleni lepulasitiki le-polyethylene bese uyigcina ivaliwe; kunezimbobo ezimbili epulakini, bese kufakwa ithubhu elilodwa lengilazi emgodini ngamunye, ithubhu elilodwa lixhunywe nethubhu le-soda lime, bese kusetshenziswa ithubhu elilodwa lokumunca uketshezi.
2. Isixazululo sesibonakaliso se-Phenolphthalein Thatha i-1g ye-phenolphthalein, engeza i-100mL ye-ethanol ukuze incibilike
3. Isixazululo se-sodium thiosulfate titration (0.02mol/L) Ukulungiselela: Thatha u-26g we-sodium thiosulfate kanye no-0.20g we-sodium carbonate engamanzi, engeza inani elifanele lamanzi abandayo abilisiwe ukuze ancibilike ku-1000mL, unyakazise kahle, bese uwubeka isihlungi senyanga eyi-1. Ukulinganisa: thatha cishe u-0.15g we-potassium dichromate ejwayelekile eyomisiwe ku-120°C ngesisindo esingaguquki, uyilinganise kahle, uyibeke ebhodleleni le-iodine, engeza u-50mL wamanzi ukuze uncibilike, engeza u-2.0g we-potassium iodide, unyakazise kancane ukuze uncibilike, engeza u-40mL we-sulfuric acid encibilikisiwe, Nyusa kahle bese uvala kahle; ngemva kwemizuzu eyi-10 endaweni emnyama, engeza u-250mL wamanzi ukuze uncibilike, futhi uma isixazululo sincibilikisiwe eduze nendawo yokugcina, engeza u-3mL wesisombululo se-starch indicator, qhubeka nokuxuba kuze kube yilapho umbala oluhlaza okwesibhakabhaka unyamalala futhi ube luhlaza okwesibhakabhaka, bese umphumela we-titration usetshenziswa njengokulungiswa kwesilingo okungenalutho. I-1mL ngayinye ye-sodium thiosulfate (0.1mol/L) ilingana no-4.903g we-potassium dichromate. Bala ukuhlushwa kwesisombululo ngokuya ngokusetshenziswa kwesisombululo kanye nenani le-potassium dichromate elithathiwe. Nciphisa ngobuningi izikhathi ezi-5 ukuze wenze ukuhlushwa kube ngu-0.02mol/L. Uma izinga lokushisa legumbi lingaphezu kuka-25°C, izinga lokushisa lesisombululo sokusabela kanye namanzi okuxuba kufanele kupholiswe kufinyelele cishe ku-20°C.
4. Isixazululo sesibonakaliso sesitashi Thatha u-0.5g wesitashi esincibilikayo, engeza u-5mL wamanzi bese uvuselela kahle, bese uthela kancane ku-100mL wamanzi abilayo, uvuselele njengoba engezwa, qhubeka ubilise imizuzu emi-2, uyivumele iphole, uthele i-supernatant, bese isilungile.
Lesi sixazululo kufanele silungiswe kabusha ngaphambi kokusetshenziswa.
Izinyathelo zokusebenza: Thatha u-0.1g walo mkhiqizo, uwulinganise kahle, uwufake ebhodleleni lokucwilisa u-D, engeza u-10mL wesisombululo se-cadmium trichloride esingu-30% (g/g). Gcwalisa ithubhu elikhiqiza umusi u-B ngamanzi esihlanganisi, bese uxhuma iyunithi yokucwilisa u-B no-D ebhavini lamafutha (kungaba yi-glycerin), yenza izinga loketshezi lebhavini lamafutha lihambisane nezinga loketshezi lesisombululo se-cadmium trichloride ebhodleleni u-D, uvule amanzi okupholisa, futhi uma kudingeka, vumela umfudlana we-nitrogen ungene bese ulawula izinga lokugeleza kwawo libe yi-bubble eli-1 ngomzuzwana. Kungakapheli imizuzu engama-30, phakamisa izinga lokushisa lebhavu lamafutha liye ku-155ºC, bese ugcina leli zinga lokushisa kuze kube yilapho kuqoqwa ama-50 mL e-distillate, susa ithubhu le-condenser kukholomu yokuhlukaniswa, hlanza ngamanzi, ugeze bese ufaka esixazululweni esiqoqiwe, engeza amaconsi amathathu esisombululo se-phenolphthalein indicator, bese u-titrate ku-. Inani le-pH lingu-6.9-7.1 (elilinganiswa ngemitha ye-acidity), bhala phansi ivolumu esetshenzisiwe i-V1 (mL), bese ufaka u-0.5g we-sodium bicarbonate kanye no-10mL we-dilute sulfuric acid, uyiyeke ime kuze kube yilapho kungasakhiqizwa i-carbon dioxide, engeza u-1.0g we-potassium iodide, bese uyivala. Shukumisa kahle, beka ebumnyameni imizuzu emi-5, engeza u-1mL wesisombululo se-starch indicator, titrate ngesisombululo se-sodium thiosulfate titration (0.02mol/L) kuze kube sekupheleni, bhala phansi ivolumu esetshenzisiwe i-V2 (mL). Kokunye ukuhlolwa okungenalutho, bhala phansi amavolumu e-Va kanye ne-Vb (mL) yesisombululo se-sodium hydroxide titration esisetshenzisiwe (0.02mol/L) kanye nesisombululo se-sodium thiosulfate titration (0.02mol/L) ngokulandelana.
Isikhathi sokuthunyelwe: Ephreli-25-2024