iindlela zovavanyo
Igama lendlela: i-hypromellose-ukuzimisela kweqela le-hydroxypropoxy-ukuzimisela kweqela le-hydroxypropoxy
Ubungakanani besicelo: Le ndlela isebenzisa indlela yokumisela i-hydroxypropoxy ukumisela umxholo we-hydroxypropoxy kwi-hypromellose. Le ndlela isetyenziswa kwi-hypromellose.
Umgaqo wendlela:Bala iumxholo we-hydroxypropoxy kwimveliso yovavanyo ngokwendlela yokumisela i-hydroxypropoxy.
I-Reagent:
1. I-30% (g/g) isisombululo sechromium trioxide
2. I-hydroxide
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:
Ukulungiselela isampuli:
1. Unyibiliko lwesodium 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 se-Phenolphthalein Thatha i-1g ye-phenolphthalein, yongeza i-100mL ye-ethanol ukunyibilika
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 umlinganiselo ofanelekileyo wamanzi abandayo asandul 'ukubiliswa ukunyibilika kwi-1000mL, xubha kakuhle, kwaye uyibeke kwi-1 inyanga yokucoca. Ukulinganisa: thatha malunga ne-0.15g ye-dichromate ye-potassium 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-dilute eqinile, i-shark sulfuric, i-dilute ye-sulfuric exutywe kakuhle; emva kwemizuzu eyi-10 kwindawo emnyama, yongeza i-250mL yamanzi ukuze uhlambulule, kwaye xa isisombululo sifakwe kwi-titrated kufuphi nesiphelo, yongeza i-3mL yesisombululo sesalathisi se-starch, qhubeka ne-titration de umbala oluhlaza unyamalale kwaye ube luhlaza oqaqambileyo, kwaye umphumo we-titration usetyenziswa njengolungiso olungenanto lweSilingo. Yonke i-1mL ye-sodium thiosulfate (0.1mol / L) ilingana ne-4.903g ye-potassium dichromate. Bala ukugxilwa kwesisombululo ngokusetyenziswa kwesisombululo kunye nesixa se-potassium dichromate ethathiweyo. 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 sesitashi Thatha i-0.5g ye-starch e-soluble, yongeza i-5mL yamanzi kwaye ugxobhoze kakuhle, uze uthele ngokukhawuleza kwi-100mL yamanzi abilayo, ugxobhoze njengoko ugalelwe, uqhubeke ubilisa imizuzu emi-2, uvumele ukupholisa, uthele i-supernatant, kwaye ilungile.
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 umlambo we-nitrogen ungene kwaye ulawule izinga lokuhamba kwayo ukuya kwi-bubble eyi-1 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 ye-fractionation, uhlambulule ngamanzi, uhlambe kwaye udibanise kwisisombululo esiqokelelweyo, yongeza i-3 yehla ye-phenolphthalein isisombululo sesalathisi, kunye ne-titrate 1 nge-acidity ye-pH9. imitha), rekhoda umthamo osetyenzisiweyo we-V1 (mL), emva koko wongeze i-0.5g ye-sodium bicarbonate kunye ne-10mL ye-dilute sulfuric acid, yiyeke ime kude kungabikho ikharbon diokside iveliswa, yongeza i-1.0g ye-iodide ye-potassium, kwaye uyitywine, Shake kakuhle, ubeke ebumnyameni imizuzu emi-5, yongeza i-1mL yesisombululo se-sodium ye-sodium tiltrate yesisombululo se-starch. (0.02mol / L) ukuya kwindawo yokugqibela, bhala umthamo ogqityiweyo weV2 (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.
Ixesha lokuposa: Apr-25-2024