Dzina la njira: hypromellose - kutsimikiza kwa hydroxypropoxy - kutsimikiza kwa hydroxypropoxy
Kuchuluka kwa ntchito: Njirayi imagwiritsa ntchito njira yodziwira hydroxypropoxy kuti mudziwe zomwe zili mu hydroxypropoxy mu hypromellose.
Njira imeneyi imagwira ntchito kwa hypromellose.
Mfundo ya njirayi: Kuwerengera zomwe zili mu hydroxypropoxy muzoyeserera molingana ndi njira yodziwira hydroxypropoxy.
Reagent:
1. 30% (g/g) chromium trioxide solution
2. Sodium hydroxide titration solution (0.02mol/L)
3. Phenolphthalein chizindikiro njira
4. Sodium bicarbonate
5. Sula sulfuric acid
6. ayodini ya potaziyamu
7. Sodium thiosulfate titration solution (0.02mol/L)
8. Wowuma chizindikiro njira
zida:
Kukonzekera kwachitsanzo: 1. Sodium hydroxide titration solution (0.02mol/L)
Kukonzekera: Tengani 5.6mL ya sodium saturated sodium hydroxide solution, onjezerani madzi ozizira owiritsa kumene kuti 1000mL.
Kulinganiza: Tengani pafupifupi 6g ya potassium hydrogen phthalate yowuma pa 105°C kuti ikhale yolemera nthawi zonse, yesani molondola, onjezerani 50mL wa madzi ozizira owiritsa kumene, gwedezani kuti asungunuke momwe mungathere;onjezerani madontho a 2 a phenolphthalein indicator solution, gwiritsani ntchito Liquid titration, pamene mukuyandikira mapeto, potaziyamu hydrogen phthalate iyenera kusungunuka kwathunthu, ndikusinthidwa mpaka yankho likhala pinki.1mL iliyonse ya sodium hydroxide titration solution (1mol/L) ndi yofanana ndi 20.42mg ya potassium hydrogen phthalate.Kuwerengera kuchuluka kwa yankholi potengera kumwa kwa yankholi komanso kuchuluka kwa potaziyamu hydrogen phthalate yomwe yatengedwa.Pang'onopang'ono kuchepetsa nthawi 5 kuti ndende 0.02mol/L.
Kusungirako: Ikani mu botolo la pulasitiki la polyethylene ndikusunga losindikizidwa;Pali mabowo awiri mu pulagi, ndipo chubu lagalasi limodzi limalowetsedwa mu dzenje lililonse, chubu 1 chimalumikizidwa ndi chubu cha soda, ndipo chubu 1 chimagwiritsidwa ntchito kuyamwa madziwo.
2. Phenolphthalein chizindikiro njira
Tengani 1g ya phenolphthalein, onjezerani 100mL wa ethanol kuti musungunuke.
3. Sodium thiosulfate titration solution (0.02mol/L)
Kukonzekera: Tengani 26g ya sodium thiosulfate ndi 0.20g ya anhydrous sodium carbonate, onjezerani mlingo woyenera wa madzi ozizira owiritsa kumene kuti asungunuke mu 1000mL, gwedezani bwino, ndi fyuluta mutayima kwa mwezi umodzi.
Kulinganiza: tengani pafupifupi 0,15g ya dichromate ya potaziyamu yowuma pa 120 ° C ndi kulemera kosalekeza, muyese bwino, ikani mu botolo la ayodini, onjezerani 50mL wa madzi kuti asungunuke, onjezerani 2.0g wa potaziyamu iodide, gwedezani mofatsa kuti musungunuke, onjezerani. 40mL ya dilute sulfuric acid, Gwirani bwino ndikusindikiza mwamphamvu;Pambuyo pa mphindi 10 pamalo amdima, onjezani 250mL yamadzi kuti muchepetse, ndipo yankho likafika kumapeto, onjezerani 3mL ya yankho la wowuma, pitilizani kuwongolera mpaka mtundu wa buluu utayika ndikukhala wobiriwira wobiriwira, ndipo zotsatira zake zimakhala zobiriwira. imagwiritsidwa ntchito ngati kuwongolera kwa Mayesero opanda kanthu.1mL iliyonse ya sodium thiosulfate (0.1mol/L) ndi yofanana ndi 4.903g ya potassium dichromate.Kuwerengera kuchuluka kwa yankho molingana ndi kumwa kwa yankho ndi kuchuluka kwa potaziyamu dichromate yomwe yatengedwa.Pang'onopang'ono kuchepetsa nthawi 5 kuti ndende 0.02mol/L.
Ngati kutentha kwa chipinda kuli pamwamba pa 25 ° C, kutentha kwa yankho ndi madzi osungunuka kuyenera kuchepetsedwa kufika 20 ° C.
4. Wowuma chizindikiro njira
Tengani 0,5g wa wowuma sungunuka, onjezerani 5mL wa madzi ndikugwedeza bwino, kenako pang'onopang'ono kutsanulira mu 100mL ya madzi otentha, yambitsani pamene mukuwonjezera, pitirizani kuwira kwa mphindi ziwiri, mulole kuti muzizizira, tsanulirani chapamwamba, ndipo mutenge.Njirayi iyenera kukonzedwa mwatsopano musanagwiritse ntchito.
Njira zogwirira ntchito: Tengani 0.1g ya mankhwalawa, yezani molondola, ikani mu botolo la distillation D, onjezerani 10mL ya 30% (g/g) cadmium trichloride solution.Dzazani chubu B chopangira nthunzi ndi madzi polumikizira, ndikulumikiza cholumikizira.Miwiritsani zonse ziwiri B ndi D mu kusamba kwamafuta (atha kukhala glycerin), pangani kuchuluka kwamadzi mumtsuko wamafuta kuti agwirizane ndi mulingo wamadzimadzi a cadmium trichloride solution mubotolo D, yatsani madzi ozizira, ndipo ngati kuli kofunikira, lolani. mtsinje wa nayitrogeni umalowa mkati ndikuwongolera kuthamanga kwake mpaka 1 thovu pa sekondi imodzi.Pakadutsa mphindi 30, kwezani kutentha kwa mafuta osambira ku 155ºC, ndikusunga kutentha kumeneku mpaka 50 ml ya distillate itasonkhanitsidwa, chotsani chubu cha condenser pagawo logawanitsa, tsukani ndi madzi, sambani ndi kuphatikiza mumadzi osonkhanitsidwa, onjezerani 3. madontho a phenolphthalein indicator solution, ndipo gwiritsani ntchito Titrate mpaka pH value ikhale 6.9-7.1 (yoyezedwa ndi mita ya acidity), lembani voliyumu yomwe yadyedwa V1 (mL), kenaka yikani 0.5g ya sodium bicarbonate ndi 10mL ya dilute sulfuric acid, mulole izo imani mpaka mpweya woipa usatulukenso, onjezerani 1.0g wa potaziyamu iodide, isindikize mwamphamvu, gwedezani bwino, ikani pamalo amdima kwa mphindi zisanu, onjezerani 1mL ya starch indicator solution, titrate mpaka kumapeto ndi sodium thiosulfate titration. yankho (0.02mol/L), ndikujambulitsa voliyumu yodyedwa V2 (mL).Mu mayeso ena opanda kanthu, lembani ma voliyumu a Va ndi Vb (mL) a sodium hydroxide titration solution (0.02mol/L) ndi sodium thiosulfate titration solution (0.02mol/L) motsatana.Kuwerengera zomwe zili mu hydroxypropoxyl.
Nthawi yotumiza: Apr-14-2023