Indlela yegama: i-hypromellose-ukuzimisela kwe-hydroxypropoxy-ukuzimisela kwe-hydroxypropoxy
Ubungakanani besicelo: Le ndlela isebenzisa indlela yokumisela i-hydroxypropoxy ukumisela umxholo we-hydroxypropoxy kwi-hypromellose.
Le ndlela isetyenziswa kwi-hypromellose.
Umgaqo wendlela: Bala umxholo we-hydroxypropoxy kwimveliso yokuvavanya ngokwendlela yokumisela i-hydroxypropoxy.
I-Reagent:
1. I-30% (g/g) isisombululo sechromium trioxide
2. Unyibiliko lwesodium hydroxide titration (0.02mol/L)
3. Isisombululo sesalathisi sePhenolphthalein
4. I-sodium bicarbonate
5. Nciphisa i-asidi ye-sulfuric
6. Iodide ye-potassium
7. Isisombululo sesodium thiosulfate titration (0.02mol/L)
8. Isisombululo sesalathisi sesitatshi
izixhobo:
Ukulungiswa kwesampuli: 1. Isisombululo se-sodium hydroxide titration (0.02mol/L)
Ukulungiselela: Thatha i-5.6mL yesisombululo esicacileyo sesodium hydroxide, yongeza amanzi abandayo asandul 'ukubiliswa ukwenza i-1000mL.
Ukulinganisa: Thatha malunga ne-6g ye-potassium ye-hydrogen phthalate eqhelekileyo yomiswe kwi-105 ° C ukuya kubunzima obuqhubekayo, ulinganise ngokuchanekileyo, yongeza i-50mL yamanzi abandayo asandul 'ukubiliswa, shukumisa ukuze udibanise kangangoko kunokwenzeka;yongeza ama-2 amaconsi esisombululo sesalathisi se-phenolphthalein, sebenzisa le titration ye-Liquid, xa usondela ekupheleni, i-potassium hydrogen phthalate kufuneka ichithwe ngokupheleleyo, kwaye i-titrated de isisombululo sibe pink.Yonke i-1mL yesisombululo se-sodium hydroxide titration (1mol / L) ilingana ne-20.42mg ye-potassium hydrogen phthalate.Bala ukuxinwa kwesi sisombululo ngokusekelwe ekusetyenzisweni kwesi sisombululo kunye nesixa se-potassium hydrogen phthalate ethathiweyo.Ngobungakanani dilute amaxesha ama-5 ukwenza i-concentration ibe yi-0.02mol/L.
Ukugcina: Yifake kwibhotile yeplastiki ye-polyethylene kwaye uyigcine ivaliwe;kukho imingxunya emi-2 kwiplagi, kwaye ityhubhu yeglasi e-1 ifakwe kumngxuma ngamnye, ityhubhu e-1 idityaniswe netyhubhu yekalika yesoda, kwaye ityhubhu e-1 isetyenziselwa ukufunxa ulwelo.
2. Isisombululo sesalathisi sePhenolphthalein
Thatha i-1g ye-phenolphthalein, yongeza i-100mL ye-ethanol ukunyibilikisa
3. Isisombululo sesodium thiosulfate titration (0.02mol/L)
Ukulungiselela: Thatha i-26g ye-sodium thiosulfate kunye ne-0.20g ye-anhydrous sodium carbonate, yongeza umlinganiselo ofanelekileyo wamanzi abandayo asandul 'ukubiliswa ukuze unyibilike kwi-1000mL, xubha kakuhle, kwaye ukucoca emva kokuma kwinyanga enye.
Ukulinganisa: thatha malunga ne-0.15g ye-potassium dichromate eyomileyo kwi-120 ° C kunye nobunzima obuqhubekayo, ulinganise ngokuchanekileyo, uyibeke kwibhotile ye-iodine, yongeza i-50mL yamanzi ukunyibilika, yongeza i-2.0g ye-iodide ye-potassium, xubha ngobumnene ukunyibilika, yongeza. I-40mL ye-asidi ye-sulfuric dilute, Shake kakuhle kwaye utywine ngokuqinileyo;emva kwemizuzu eli-10 kwindawo emnyama, yongeza i-250mL yamanzi ukuze uhlambulule, kwaye xa isisombululo sithatyathelwa kufutshane nesiphelo, yongeza i-3mL yesisombululo sesitatshi, qhubeka ne-titration de umbala oluhlaza unyamalale kwaye ube luhlaza oqaqambileyo, kunye nesiphumo se-titration. isetyenziswa njengesilungiso esingenanto.Yonke i-1mL ye-sodium thiosulfate (0.1mol / L) ilingana ne-4.903g ye-potassium dichromate.Bala ukugxininiswa kwesisombululo ngokusetyenziswa kwesisombululo kunye nesixa se-potassium dichromate esithathiweyo.Ngobungakanani dilute amaxesha ama-5 ukwenza i-concentration ibe yi-0.02mol/L.
Ukuba ubushushu begumbi bungaphezulu kwama-25°C, iqondo lobushushu lesisombululo sokusabela kunye namanzi okuxutywa kufuneka apholiswe malunga ne-20°C.
4. Isisombululo sesalathisi sesitatshi
Thatha i-0.5g ye-starch e-soluble, yongeza i-5mL yamanzi kwaye udibanise kakuhle, emva koko ugalele i-100mL yamanzi abilayo, ugxobhoze njengoko udibanisa, qhubeka ubilisa imizuzu emi-2, uvumele upholile, ugalele i-supernatant, kwaye ufumane.Esi sisombululo kufuneka silungiswe ngokutsha ngaphambi kokusetyenziswa.
Amanyathelo okusebenza: Thatha i-0.1g yale mveliso, yilinganise ngokuchanekileyo, uyibeke kwibhotile ye-distillation D, yongeza i-10mL ye-30% (g / g) isisombululo se-cadmium trichloride.Gcwalisa ityhubhu evelisa umphunga B ngamanzi ukuya kwindawo edibeneyo, kwaye udibanise iyunithi ye-distillation.Gxininisa zombini i-B kunye ne-D kwindawo yokuhlambela i-oyile (inokuba yi-glycerin), yenza inqanaba lolwelo lwebhafu yeoli lihambelane nenqanaba lolwelo lwesisombululo se-cadmium trichloride kwibhotile D, vula amanzi okupholisa, kwaye ukuba kuyimfuneko, vumela. umjelo wenitrogen ungene kwaye ulawule izinga lokuqukuqela kwawo ukuya kwiqamza elinye ngomzuzwana.Ngaphakathi kwemizuzu engama-30, phakamisa ubushushu bokuhlamba i-oyile ukuya kwi-155ºC, kwaye ugcine lo bushushu kude kube yi-50 mL ye-distillate iqokelelwe, susa ityhubhu ye-condenser kwikholamu yokwahlula, hlambulula ngamanzi, uhlambe kwaye udibanise kwi-liquid eqokelelweyo, yongeza i-3. amaconsi esisombululo sesalathisi se-phenolphthalein, kwaye usebenzise i-Titrate de ixabiso le-pH liyi-6.9-7.1 (ilinganiswe ngemitha ye-acidity), bhala umthamo osetyenzisiweyo we-V1 (mL), uze wongeze i-0.5g ye-sodium bicarbonate kunye ne-10mL ye-dilute sulfuric acid, yiyeke. yima de kungabikho i-carbon dioxide eveliswayo, yongeza i-1.0g ye-iodide ye-potassium, Yitywine ngokuqinileyo, uyishukumise kakuhle, uyibeke kwindawo emnyama imizuzu emi-5, yongeza i-1mL yesisombululo sesalathisi se-starch, i-titrate ukuya ekupheleni kunye ne-sodium thiosulfate titration. isisombululo (0.02mol / L), kwaye urekhode umthamo ogqityiweyo we-V2 (mL).Kolunye uvavanyo olungenanto, bhala imiqulu ye-Va kunye ne-Vb (mL) yesisombululo se-sodium hydroxide titration (0.02mol / L) kunye ne-sodium thiosulfate titration solution (0.02mol / L) ngokulandelanayo.Bala umxholo wehydroxypropoxyl.
Ixesha lokuposa: Apr-14-2023