iindlela zovavanyo
Igama lendlela: i-hypromellose—ukuchonga iqela le-hydroxypropoxy—ukuchonga iqela le-hydroxypropoxy
Ububanzi bokusetyenziswa: Le ndlela isebenzisa indlela yokumisela i-hydroxypropoxy ukufumanisa umxholo we-hydroxypropoxy kwi-hypromellose. Le ndlela iyasebenza kwi-hypromellose.
Umgaqo wendlela:Balaumxholo we-hydroxypropoxy kwimveliso yovavanyo ngokwendlela yokumisela i-hydroxypropoxy.
I-Reagent:
1. Isisombululo se-chromium trioxide esingama-30% (g/g)
2. I-Hadroxide
3. Isisombululo sesalathisi sePhenolphthalein
4. I-sodium bicarbonate
5. Nciphisa i-sulfuric acid
6. I-potassium iodide
7. Isisombululo se-sodium thiosulfate titration (0.02mol/L)
8. Isisombululo sesalathisi sesitatshi
izixhobo:
Ukulungiselela isampuli:
1. Isisombululo se-sodium hydroxide titration (0.02mol/L)
Ukulungiselela: Thatha i-5.6mL yesisombululo se-sodium hydroxide esicacileyo, yongeza amanzi abandayo asandula ukubila ukuze ibe yi-1000mL.
Ukulinganisa: Thatha malunga ne-6g ye-potassium hydrogen phthalate esemgangathweni eyomileyo kwi-105°C ukuya kubunzima obungaguqukiyo, yilinganise ngokuchanekileyo, yongeza i-50mL yamanzi abandayo asandul' ukubila, yishukumise ukuze inyibilike kangangoko; yongeza amathontsi ama-2 esisombululo se-phenolphthalein indicator, sebenzisa le titration yeLiquid, xa usondela kwisiphelo, i-potassium hydrogen phthalate kufuneka ichithwe ngokupheleleyo, kwaye inyibilike de isisombululo sibe pinki. I-1mL nganye yesisombululo se-sodium hydroxide titration (1mol/L) ilingana ne-20.42mg ye-potassium hydrogen phthalate. Bala uxinzelelo lwesi sisombululo ngokusekelwe ekusetyenzisweni kwesi sisombululo kunye nobungakanani be-potassium hydrogen phthalate ethathiweyo. Yixube ngobuninzi izihlandlo ezi-5 ukuze wenze uxinzelelo lube yi-0.02mol/L.
Indawo yokugcina: Yifake kwibhotile yeplastiki yepolyethylene uze uyigcine ivaliwe; kukho imingxunya emibini kwiplagi, kwaye kufakwa ityhubhu yeglasi e-1 kumngxunya ngamnye, ityhubhu e-1 iqhagamshelwe kwityhubhu yelayisi yesoda, kwaye ityhubhu e-1 isetyenziselwa ukufunxa ulwelo.
2. Isisombululo se-Phenolphthalein esichazayo Thatha i-1g ye-phenolphthalein, yongeza i-100mL ye-ethanol ukuze inyibilike
3. Isisombululo se-sodium thiosulfate titration (0.02mol/L) Ukulungiselela: Thatha i-26g ye-sodium thiosulfate kunye ne-0.20g ye-anhydrous sodium carbonate, yongeza amanzi abandayo abilayo afanelekileyo ukuze anyibilike kwi-1000mL, shukumisa kakuhle, kwaye uyibeke kwisihluzo senyanga e-1. Ukulinganisa: thatha malunga ne-0.15g ye-potassium dichromate esemgangathweni eyomileyo kwi-120°C enobunzima obungaguqukiyo, yilinganise ngokuchanekileyo, uyibeke kwibhotile ye-iodine, yongeza i-50mL yamanzi ukuze inyibilike, yongeza i-2.0g ye-potassium iodide, shukumisa kancinci ukuze inyibilike, yongeza i-40mL ye-sulfuric acid enyibilikisiweyo, Shukumisa kakuhle kwaye uyivale kakuhle; emva kwemizuzu eli-10 endaweni emnyama, yongeza i-250mL yamanzi ukuze inyibilike, kwaye xa isisombululo sitshisiwe kufutshane nendawo yokugqibela, yongeza i-3mL yesisombululo se-starch indicator, qhubeka ne-titration de umbala oluhlaza okwesibhakabhaka uphele kwaye ube luhlaza okhanyayo, kwaye isiphumo se-titration sisetyenziswa njengolungiso lweTrial olungenanto. I-1mL nganye ye-sodium thiosulfate (0.1mol/L) ilingana ne-4.903g ye-potassium dichromate. Bala uxinzelelo lwesisombululo ngokwendlela esisetyenziswe ngayo isisombululo kunye nobungakanani be-potassium dichromate ethathiweyo. Dilute ngobuninzi izihlandlo ezi-5 ukuze wenze uxinzelelo lube yi-0.02mol/L. Ukuba ubushushu begumbi bungaphezulu kwama-25°C, ubushushu besisombululo sokusabela kunye namanzi axutyiweyo kufuneka zipholiswe ukuya kuma-20°C.
4. Isisombululo sesalathisi sesitatshi Thatha i-0.5g yesitatshi esinyibilikayo, yongeza i-5mL yamanzi uze uxube kakuhle, uze ugalele kancinci kwi-100mL yamanzi abilayo, uxube njengoko isongezwa, qhubeka ubilisa imizuzu emi-2, yivumele iphole, galela i-supernatant, kwaye ilungile.
Esi sisombululo kufuneka silungiswe ngokutsha ngaphambi kokuba sisetyenziswe.
Amanyathelo okusebenza: Thabatha i-0.1g yale mveliso, uyilinganise ngokuchanekileyo, uyifake kwibhotile yokunyibilikisa ulwelo D, yongeza i-10mL yesisombululo se-cadmium trichloride esingama-30% (g/g). Zalisa ityhubhu yokuvelisa umphunga B ngamanzi kwijoyinti, uze uqhagamshele iyunithi yokunyibilikisa ulwelo. Faka zombini i-B kunye ne-D kwibhafu yeoyile (ingaba yi-glycerin), yenza inqanaba lolwelo lebhafu yeoyile lihambelane nenqanaba lolwelo lwesisombululo se-cadmium trichloride kwibhotile ye-D, vula amanzi okupholisa, kwaye ukuba kuyimfuneko, vumela umsinga we-nitrogen ungene kwaye ulawule isantya sokuhamba kwawo ukuya kwi-bubble enye ngomzuzwana. Kwimizuzu engama-30, nyusa ubushushu bebhafu yeoyile ukuya kwi-155ºC, kwaye ugcine obu bushushu de kuqokelelwe i-50 mL ye-distillate, susa ityhubhu ye-condenser kwikholamu yokuqhekeza, hlambulula ngamanzi, uhlambe uze ufake kwisisombululo esiqokelelweyo, yongeza amaconsi ama-3 esisombululo se-phenolphthalein indicator, kwaye u-titrate ukuya kwi-. Ixabiso le-pH yi-6.9-7.1 (ilinganiswe nge-acidity meter), bhala phantsi umthamo osetyenzisiweyo i-V1 (mL), uze wongeze i-0.5g ye-sodium bicarbonate kunye ne-10mL ye-dilute sulfuric acid, yiyeke ime ide ingabi saveliswa i-carbon dioxide, yongeza i-1.0g ye-potassium iodide, kwaye uyivale. Shukumisa kakuhle, yibeke ebumnyameni imizuzu emi-5, yongeza i-1mL yesisombululo se-starch indicator, u-titrate kunye nesisombululo se-sodium thiosulfate titration (0.02mol/L) ukuya ekupheleni, bhala phantsi umthamo osetyenzisiweyo i-V2 (mL). Kolunye uvavanyo olungenanto, bhala phantsi iivolumu ze-Va kunye ne-Vb (mL) zesisombululo se-sodium hydroxide titration esisetyenzisiweyo (0.02mol/L) kunye nesisombululo se-sodium thiosulfate titration (0.02mol/L) ngokulandelelana.
Ixesha leposi: Epreli-25-2024