njira zoyesera
Dzina la njira: hypromellose—kutsimikiza gulu la hydroxypropoxy—kutsimikiza gulu la hydroxypropoxy
Kuchuluka kwa ntchito: Njira iyi imagwiritsa ntchito njira yodziwira hydroxypropoxy kuti idziwe kuchuluka kwa hydroxypropoxy mu hypromellose. Njirayi imagwira ntchito pa hypromellose.
Mfundo ya njira iyi:Werengeranikuchuluka kwa hydroxypropoxy mu chinthu choyesera malinga ndi njira yodziwira hydroxypropoxy.
Chothandizira:
1. 30% (g/g) yankho la chromium trioxide
2. Hydroxide
3. Yankho la chizindikiro cha Phenolphthalein
4. Sodium bicarbonate
5. Sakanizani sulfuric acid
6. Potaziyamu iyodi
7. Sodium thiosulfate titration solution (0.02mol/L)
8. Yankho la chizindikiro cha sitachi
zida:
Kukonzekera chitsanzo:
1. Sodium hydroxide titration solution (0.02mol/L)
Kukonzekera: Imwani 5.6mL ya sodium hydroxide yoyera bwino, onjezerani madzi ozizira owiritsa kumene kuti mukhale 1000mL.
Kulinganiza: Imwani pafupifupi 6g ya potaziyamu hydrogen phthalate yowuma pa 105°C kuti ikhale yolemera mofanana, yesani bwino, onjezerani 50mL ya madzi ozizira owiritsidwa kumene, gwedezani kuti isungunuke momwe mungathere; onjezerani madontho awiri a phenolphthalein indicator solution, gwiritsani ntchito Liquid titration iyi, mukafika kumapeto, potaziyamu hydrogen phthalate iyenera kusungunuka kwathunthu, ndikuyikidwa mpaka yankho litakhala pinki. 1mL iliyonse ya sodium hydroxide titration solution (1mol/L) ndi yofanana ndi 20.42mg ya potaziyamu hydrogen phthalate. Werengani kuchuluka kwa yankholi kutengera momwe yankholi limagwiritsidwira ntchito komanso kuchuluka kwa potaziyamu hydrogen phthalate yomwe mwatenga. Sakanizani mochuluka kasanu kuti mupange kuchuluka kwa 0.02mol/L.
Kusungira: Ikani mu botolo la pulasitiki la polyethylene ndipo lisungeni lotsekedwa; pali mabowo awiri mu pulagi, ndipo chubu chimodzi chagalasi chimayikidwa mu dzenje lililonse, chubu chimodzi chimalumikizidwa ndi chubu cha soda laimu, ndipo chubu chimodzi chimagwiritsidwa ntchito pokoka madzi.
2. Njira yodziwira chizindikiro cha Phenolphthalein. Tengani 1g ya phenolphthalein, onjezerani 100mL ya ethanol kuti isungunuke.
3. Sodium thiosulfate titration solution (0.02mol/L) Kukonzekera: Imwani 26g ya sodium thiosulfate ndi 0.20g ya sodium carbonate yosaphwanyika, onjezerani madzi ozizira owiritsa bwino kuti asungunuke mu 1000mL, gwedezani bwino, ndikuyiyika kwa mwezi umodzi fyuluta. Kukonza: Imwani pafupifupi 0.15g ya potassium dichromate yowuma pa 120°C ndi kulemera kosalekeza, yesani bwino, ikani mu botolo la ayodini, onjezerani 50mL ya madzi kuti asungunuke, onjezerani 2.0g ya potassium iodide, gwedezani pang'onopang'ono kuti musungunuke, onjezerani 40mL ya sulfuric acid yochepetsedwa, Gwedezani bwino ndikutseka mwamphamvu; Patatha mphindi 10 pamalo amdima, onjezani 250mL ya madzi kuti musungunuke, ndipo yankho likamathiridwa pafupi ndi kumapeto, onjezani 3mL ya solution yowonetsa starch, pitirizani kuthira mpaka mtundu wabuluu utasowa ndikukhala wobiriwira wowala, ndipo zotsatira za titration zimagwiritsidwa ntchito ngati Trial correction yopanda kanthu. 1mL iliyonse ya sodium thiosulfate (0.1mol/L) ndi yofanana ndi 4.903g ya potassium dichromate. Werengani kuchuluka kwa yankho malinga ndi momwe yankholo lagwiritsidwira ntchito komanso kuchuluka kwa potassium dichromate yomwe mwamwa. Sakanizani mochuluka kasanu kuti kuchuluka kwake kukhale 0.02mol/L. Ngati kutentha kwa chipinda kuli pamwamba pa 25°C, kutentha kwa yankholo ndi madzi osungunuka kuyenera kuziziritsidwa kufika pafupifupi 20°C.
4. Njira yodziwira sitachi. Tengani 0.5g ya sitachi yosungunuka, onjezerani 5mL ya madzi ndikusakaniza bwino, kenako pang'onopang'ono tsanulirani mu 100mL ya madzi otentha, sakanizani pamene akuwonjezeredwa, pitirizani kuwira kwa mphindi ziwiri, lolani kuti zizizire, tsanulirani supernatant, ndipo yakonzeka.
Yankho ili liyenera kukonzedwa mwatsopano musanagwiritse ntchito.
Njira Zogwirira Ntchito: Tengani 0.1g ya mankhwalawa, muyeze bwino, muyike mu botolo loyeretsera D, onjezerani 10mL ya yankho la cadmium trichloride la 30% (g/g). Dzazani chubu chopangira nthunzi B ndi madzi ku cholumikizira, ndikulumikiza chipangizo choyeretsera. Imwani B ndi D mu bafa yamafuta (ikhoza kukhala glycerin), pangani kuchuluka kwa madzi mu bafa yamafuta kugwirizana ndi kuchuluka kwa madzi mu yankho la cadmium trichloride mu botolo la D, yatsani madzi ozizira, ndipo ngati kuli kofunikira, lolani mtsinje wa nayitrogeni ulowemo ndikuwongolera kuchuluka kwa madzi ake kufika pa bule imodzi pamphindikati. Pakatha mphindi 30, kwezani kutentha kwa bafa la mafuta kufika pa 155ºC, ndipo sungani kutentha kumeneku mpaka 50 mL ya distillate itasonkhanitsidwa, chotsani chubu cha condenser kuchokera mu gawo logawa, tsukani ndi madzi, sambani ndikuyika mu yankho losonkhanitsidwa, onjezerani madontho atatu a yankho la phenolphthalein indicator, ndikuwonjezera ku pH. Mtengo wa pH ndi 6.9-7.1 (woyezedwa ndi mita ya acidity), lembani kuchuluka kwa madzi omwe agwiritsidwa ntchito V1 (mL), kenako onjezerani 0.5g ya sodium bicarbonate ndi 10mL ya sulfuric acid yochepetsedwa, ikani mpaka carbon dioxide isapangidwenso, onjezerani 1.0g ya potassium iodide, ndikuitseka. Gwedezani bwino, ikani mumdima kwa mphindi 5, onjezerani 1mL ya yankho la starch indicator, tsitsani ndi yankho la sodium thiosulfate titration (0.02mol/L) mpaka kumapeto, lembani kuchuluka kwa madzi omwe agwiritsidwa ntchito V2 (mL). Mu mayeso ena opanda kanthu, lembani mavoliyumu a Va ndi Vb (mL) a yankho la sodium hydroxide titration lomwe lagwiritsidwa ntchito (0.02mol/L) ndi yankho la sodium thiosulfate titration (0.02mol/L) motsatana.
Nthawi yotumizira: Epulo-25-2024