njira zoyesera
Dzina la njira: hypromellose-kutsimikiza kwa gulu la hydroxypropoxy-kutsimikiza kwa gulu la 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 njira:Werengani theZomwe zili mu hydroxypropoxy muzoyeserera molingana ndi njira yodziwira hydroxypropoxy.
Reagent:
1. 30% (g/g) chromium trioxide solution
2. Hydrooxide
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 indicator solution 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 musungunuke mu 1000mL, gwedezani bwino, ndi kuyiyika kwa mwezi umodzi fyuluta. Kuwongolera: tengani pafupifupi 0,15g ya dichromate ya potaziyamu yowuma pa 120 ° C ndi kulemera kosalekeza, kuyeza bwino, kuika mu botolo la ayodini, onjezerani 50mL madzi kuti asungunuke, onjezerani 2.0g wa potaziyamu iodide, gwedezani mofatsa kuti musungunuke, onjezerani 40mL wa seric acid, sungani bwino sulfure; pambuyo pa mphindi 10 pamalo amdima, onjezani 250mL yamadzi kuti muchepetse, ndipo yankho likamayikidwa pafupi ndi mapeto, onjezani 3mL ya njira yowonetsera wowuma, pitirizani kutulutsa mpaka mtundu wa buluu utayika ndikukhala wobiriwira, ndipo zotsatira za titration zimagwiritsidwa ntchito ngati kuwongolera Mayesero opanda kanthu. 1mL iliyonse ya sodium thiosulfate (0.1mol/L) ndi yofanana ndi 4.903g ya potassium dichromate. Werengani 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 kukhazikika mpaka 20 ° C.
4. Wowuma chizindikiro njira Tengani 0,5g wa sungunuka wowuma, kuwonjezera 5mL madzi ndi kusonkhezera bwino, ndiye pang`onopang`ono kutsanulira mu 100mL madzi otentha, yambitsani monga iwo anawonjezera, pitirizani kuwira kwa mphindi 2, mulole kuziziritsa, kutsanulira supernatant, ndipo ndi okonzeka.
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 chotulutsa nthunzi ndi madzi polumikizana, ndikulumikiza gawo la distillation. Miwiritsani onse B ndi D mu kusamba kwamafuta (atha kukhala glycerin), pangani kuchuluka kwamadzimadzi mumadzi osamba kuti agwirizane ndi mulingo wamadzimadzi a cadmium trichloride solution mubotolo D, yatsani madzi ozizira, ndipo ngati kuli kofunikira, lolani mtsinje wa nayitrogeni ulowemo ndikuwongolera kuthamanga kwake mpaka 1 thovu pa sekondi imodzi. Pakadutsa mphindi 30, kwezani kutentha kwa mafuta osambira ku 155ºC, ndikusunga kutentha kumeneku mpaka 50mL ya distillate itasonkhanitsidwa, chotsani chubu cha condenser kuchokera pagawo la magawo, muzimutsuka ndi madzi, sambani ndi kuphatikizira mu yankho lomwe mwasonkhanitsidwa, onjezerani madontho atatu a phenolphthalein indicator solution, ndi titrate 6 pH. mita), lembani voliyumu yomwe yadyedwa V1 (mL), kenaka onjezerani 0,5g ya sodium bicarbonate ndi 10mL ya dilute sulfuric acid, muyime mpaka mpweya woipa usatulukenso, onjezerani 1.0g wa potaziyamu iodide, ndikusindikiza, Gwirani bwino, ikani mumdima kwa mphindi zisanu, onjezerani 1mL ya sodium tiotthirate solution ndi sodium tiotthirate solution, (0.02mol/L) mpaka kumapeto, lembani voliyumu yomwe yadyedwa 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.
Nthawi yotumiza: Apr-25-2024