mekhoa ea liteko
Lebitso la mokhoa: hypromellose—ho fumana sehlopha sa hydroxypropoxy—ho fumana sehlopha sa hydroxypropoxy
Sebaka sa ts'ebeliso: Mokhoa ona o sebelisa mokhoa oa ho fumana hore na hydroxypropoxy e kae ho hypromellose. Mokhoa ona o sebetsa ho hypromellose.
Molao-motheo oa mokhoa:Baladikahare tsa hydroxypropoxy sehlahisweng sa teko ho ya ka mokgwa wa ho fumana hydroxypropoxy.
Sesebediswa sa ho lokisa:
Tharollo ea chromium trioxide ea 1. 30% (g/g)
2. Hydroxide
3. Tharollo ea sesupo sa Phenolphthalein
4. Sodium bicarbonate
5. Fokotsa asiti ea sulfuric
6. Iodide ea potassium
7. Tharollo ea titration ea sodium thiosulfate (0.02mol/L)
8. Tharollo ea sesupo sa starch
lisebelisoa:
Tokisetso ea mohlala:
1. Tharollo ea titration ea sodium hydroxide (0.02mol/L)
Tokiso: Nka 5.6mL ea tharollo e hlakileng ea sodium hydroxide e tletseng metsi, eketsa metsi a batang a sa tsoa belisoa ho etsa 1000mL.
Ho lekanya: Nka hoo e ka bang 6g ea potassium hydrogen phthalate e tloaelehileng e omisitsoeng mochesong oa 105°C ho fihlela boima bo sa fetoheng, e behe ka nepo, eketsa 50mL ea metsi a batang a sa tsoa phehoa, u e sisinye ho etsa hore e qhibilihe ka hohle kamoo ho ka khonehang; eketsa marotholi a 2 a tharollo ea phenolphthalein indicator, sebelisa titration ena ea Mokelikeli, ha u atamela ntlha ea ho qetela, potassium hydrogen phthalate e lokela ho qhibilihisoa ka botlalo, 'me e qhibilihisoe ho fihlela tharollo e fetoha pinki. 1mL e 'ngoe le e 'ngoe ea tharollo ea sodium hydroxide titration (1mol/L) e lekana le 20.42mg ea potassium hydrogen phthalate. Bala mahloriso a tharollo ena ho latela tšebeliso ea tharollo ena le bongata ba potassium hydrogen phthalate e nkiloeng. Hlakola ka bongata ka makhetlo a 5 ho etsa mahloriso a 0.02mol/L.
Polokelo: E kenye ka botlolong ea polasetiki ea polyethylene 'me u e boloke e koetsoe; ho na le masoba a mabeli ka har'a polaka, 'me khalase e le' ngoe e kenngoa ka har'a lesoba ka leng, tube e le 'ngoe e hokahantsoe le tube ea soda lime, 'me tube e le' ngoe e sebelisetsoa ho monya metsi.
2. Tharollo ea sesupo sa Phenolphthalein Nka 1g ea phenolphthalein, eketsa 100mL ea ethanol ho qhala
3. Tharollo ea sodium thiosulfate titration (0.02mol/L) Tokiso: Nka 26g ea sodium thiosulfate le 0.20g ea sodium carbonate e sa tsoa belisoa, eketsa metsi a batang a sa tsoa belisoa ho qhibilihisa ka har'a 1000mL, sisinya hantle, 'me u e behe bakeng sa sefe sa khoeli e le 1. Ho lekanya: Nka hoo e ka bang 0.15g ea potassium dichromate e tloaelehileng e omisitsoeng mochesong oa 120°C ka boima bo sa fetoheng, e behe ka nepo, e behe ka botlolong ea iodine, eketsa 50mL ea metsi ho qhibilihisa, eketsa 2.0g ea potassium iodide, sisinya butle ho qhibilihisa, eketsa 40mL ea sulfuric acid e hlapolotsoeng, Sisinya hantle 'me u tiise ka thata; kamora metsotso e 10 sebakeng se lefifi, eketsa 250mL ea metsi ho qhibilihisa, 'me ha tharollo e qhibilihisoa ho fihlela qetellong, eketsa 3mL ea tharollo ea sesupo sa starch, tsoela pele ho qhibilihisa ho fihlela 'mala o moputsoa o nyamela 'me o fetoha botala bo khanyang, 'me sephetho sa tšibilihisa se sebelisoa e le tokiso ea Teko e se nang letho. 1mL e 'ngoe le e 'ngoe ea sodium thiosulfate (0.1mol/L) e lekana le 4.903g ea potassium dichromate. Bala mahloriso a tharollo ho latela tšebeliso ea tharollo le bongata ba potassium dichromate e nkiloeng. Hlakola ka bongata ka makhetlo a 5 ho etsa mahloriso a 0.02mol/L. Haeba mocheso oa kamore o le kaholimo ho 25°C, mocheso oa tharollo ea karabelo le metsi a hlapollotsoeng o lokela ho pholisoa ho fihlela ho hoo e ka bang 20°C.
4. Tharollo ea sesupo sa setache Nka 0.5g ea starch e qhibilihang, eketsa 5mL ea metsi 'me u hlohle hantle, ebe u tšela butle ka har'a 100mL ea metsi a belang, u hlohle ha e ntse e eketsoa, tsoela pele ho bela metsotso e 2, e tlohele e pholile, tšela supernatant, 'me e se e loketse.
Tharollo ena e lokela ho lokisoa bocha pele e sebelisoa.
Mehato ea ts'ebetso: Nka 0.1g ea sehlahisoa sena, u se behe ka nepo, u se kenye ka botlolong ea ho qhibilihisa D, eketsa 10mL ea tharollo ea cadmium trichloride ea 30% (g/g). Tlatsa tube e hlahisang mouoane B ka metsi lenonyellong, 'me u hokahanye yuniti ea ho qhibilihisa. Kenya B le D ka bateng ea oli (e ka ba glycerin), etsa hore boemo ba metsi ba bateng ea oli bo lumellane le boemo ba metsi ba tharollo ea cadmium trichloride ka botlolong ea D, bulela metsi a pholileng, 'me haeba ho hlokahala, tlohela molapo oa naetrojene o phalle 'me u laole sekhahla sa phallo ea oona ho ea ho bubble e le' ngoe ka motsotsoana. Nakong ea metsotso e 30, phahamisa mocheso oa bate ea oli ho 155ºC, 'me u boloke mocheso ona ho fihlela 50 mL ea distillate e bokelloa, tlosa tube ea condenser kholomong ea karohano, hlatsoa ka metsi, hlatsoa 'me u e kenye ka har'a tharollo e bokelletsoeng, eketsa marotholi a 3 a tharollo ea phenolphthalein indicator, 'me u titrate ho ea ho Boleng ba pH ke 6.9-7.1 (e lekanngoang ka meter ea asiti), ngola bophahamo ba V1 (mL), ebe u eketsa 0.5g ea sodium bicarbonate le 10mL ea sulfuric acid e hlapolotsoeng, e tlohele e eme ho fihlela ho se ho sa hlahisoe carbon dioxide, eketsa 1.0g ea potassium iodide, 'me u e koale, Hlohlelletsa hantle, beha lefifing metsotso e 5, eketsa 1mL ea tharollo ea starch indicator, titrate ka tharollo ea sodium thiosulfate titration (0.02mol/L) ho fihlela qetellong, ngola bophahamo ba V2 (mL). Tekong e 'ngoe e se nang letho, ngola meqolo ea Va le Vb (mL) ea tharollo ea titration ea sodium hydroxide e sebelisitsoeng (0.02mol/L) le tharollo ea titration ea sodium thiosulfate (0.02mol/L) ka ho latellana.
Nako ea poso: Mmesa-25-2024