Aha usoro: hypromellose - mkpebi siri ike nke hydroxypropoxy - mkpebi siri ike nke hydroxypropoxy
Oke ngwa: Usoro a na-eji usoro mkpebi hydroxypropoxy iji chọpụta ọdịnaya nke hydroxypropoxy na hypromellose.
Usoro a na-emetụta hypromellose.
Ụkpụrụ nke usoro a: Gbakọọ ọdịnaya nke hydroxypropoxy dị na ngwaahịa nnwale dịka usoro mkpebi hydroxypropoxy siri dị.
Reagent:
1. 30% (g/g) chromium trioxide ngwọta
2. Sodium hydroxide titration ngwọta (0.02mol/L)
3. Phenolphthalein egosi ngwọta
4. sodium bicarbonate
5. Gbanyụọ sulfuric acid
6. Potassium iodide
7. Sodium thiosulfate titration ngwọta (0.02mol/L)
8. Starch egosi ngwọta
akụrụngwa:
Nkwadebe nlele: 1. Sodium hydroxide titration solution (0.02mol/L)
Nkwadebe: Were 5.6mL nke ngwọta sodium hydroxide doro anya, gbakwunye mmiri oyi esiri ọhụrụ ka ọ bụrụ 1000ml.
Nhazi: Were ihe dị ka 6g nke potassium hydrogen phthalate ọkọlọtọ akpọnwụwo na 105 Celsius ka ịdị arọ mgbe niile, tụọ ya nke ọma, tinye 50mL nke mmiri oyi esiri ọhụrụ, maa jijiji ka ọ gbazee dị ka o kwere mee; tinye 2 tụlee nke phenolphthalein egosi ngwọta, jiri titration Liquid a, mgbe ị na-eru nso na njedebe, potassium hydrogen phthalate kwesịrị ịgbaze kpamkpam, na titrated ruo mgbe ngwọta na-aghọ pink. Kwa 1 ml nke sodium hydroxide titration ngwọta (1mol/L) bụ 20.42mg nke potassium hydrogen phthalate. Gbakọọ mkpokọta nke ngwọta a dabere na oriri nke ngwọta a yana ọnụọgụ potassium hydrogen phthalate weere. Tinyegharịa ugboro 5 n'ụzọ zuru ezu iji mee ntinye uche 0.02mol / L.
Nchekwa: Tinye ya na karama plastik polyethylene ma mechie ya; enwere oghere 2 na plọg ahụ, a na-etinyekwa tube iko 1 n'ime oghere ọ bụla, 1 tube jikọtara ya na tube lime soda, na 1 tube maka ịmịpụta mmiri mmiri.
2. Phenolphthalein egosi ngwọta
Were 1 g nke phenolphthalein, tinye 100 ml nke ethanol ka ọ gbazee.
3. Sodium thiosulfate titration ngwọta (0.02mol/L)
Nkwadebe: Were 26g nke sodium thiosulfate na 0.20g nke sodium carbonate anhydrous, tinye mmiri oyi esiri ọhụrụ nke ọma ka ọ gbazee n'ime 1000ml, maa jijiji nke ọma, na nyochaa mgbe ị kwụrụ otu ọnwa.
Nhazi: were ihe dị ka 0.15g nke potassium dichromate ọkọlọtọ akpọnwụwo na 120 Celsius na ịdị arọ mgbe niile, tụọ ya nke ọma, tinye ya na karama iodine, tinye 50 ml mmiri ka ọ gbazee, gbakwunye 2.0g nke potassium iodide, gbanye nwayọọ ka ọ gbazee, gbakwunye ya. 40 ml nke sulfuric acid, gbanye nke ọma ma mechie ya; Mgbe nkeji 10 gachara n'ebe gbara ọchịchịrị, gbakwunye 250ml mmiri ka ọ gbazee, ma mgbe a na-etinye ihe ngwọta ahụ na nso njedebe njedebe, gbakwunye 3mL nke ihe ngosi starch, nọgide na-agbanye ruo mgbe agba anụnụ anụnụ na-apụ n'anya wee ghọọ akwụkwọ ndụ akwụkwọ ndụ na-egbuke egbuke, na nsonaazụ titration. a na-eji dị ka mgbazi nnwale efu. Kwa 1 ml nke sodium thiosulfate (0.1mol/L) bụ 4.903g nke potassium dichromate. Gbakọọ mkpokọta nke ngwọta dịka oriri nke ngwọta na ọnụọgụ potassium dichromate weere. Tinyegharịa ugboro 5 n'ụzọ zuru ezu iji mee ntinye uche 0.02mol / L.
Ọ bụrụ na ụlọ okpomọkụ dị n'elu 25 ° C, okpomọkụ nke ngwọta mmeghachi omume na mmiri dilution kwesịrị ka ọ dị jụụ ruo ihe dịka 20 Celsius.
4. Starch egosi ngwọta
Were 0.5g nke starch soluble, tinye 5mL mmiri wee kpalie nke ọma, wee jiri nwayọọ nwayọọ wụsa n'ime 100ml nke mmiri esi, gbanye ka ị na-agbakwunye, nọgide na-esi nri maka nkeji 2, hapụ ka ọ dị jụụ, wunye ihe dị elu, ị nweta ya. Ihe ngwọta a kwesịrị ịdị njikere nke ọma tupu ejiri ya.
Usoro ọrụ: Were 0.1g nke ngwaahịa a, tụọ ya nke ọma, tinye ya na karama distillation D, tinye 10mL nke 30% (g/g) cadmium trichloride solution. Jujuo tube na-emepụta uzuoku B na mmiri na nkwonkwo, ma jikọọ unit distillation. Na-emikpu ma B na D n'ime mmanụ bat (ọ nwere ike ịbụ glycerin), mee ka mmiri mmiri nke mmanụ bat na-adabere na ọkwa mmiri nke cadmium trichloride ngwọta na karama D, gbanye mmiri jụrụ oyi, ma ọ bụrụ na ọ dị mkpa, hapụ ya. iyi nitrogen na-asọba ma na-achịkwa ọ̀tụ̀tụ̀ ịgba ọsọ ya ruo 1 afụ kwa sekọnd. N'ime nkeji 30, bulie okpomọkụ nke mmanụ bat na 155ºC, ma nọgide na-enwe okpomọkụ a ruo mgbe a na-anakọta 50 ml nke distillate, wepụ tube condenser site na kọlụm fractionation, kpochaa ya na mmiri, saa ma jikọta n'ime mmiri mmiri anakọtara, tinye 3. tụlee nke phenolphthalein egosi ngwọta, na-eji Titrate ruo mgbe pH uru bụ 6.9-7.1 (atụnyere na ihe acidity mita), dekọọ iwesa olu V1 (mL), wee tinye 0.5g nke sodium bicarbonate na 10mL nke dilute sulfuric acid, hapụ ya. guzo ruo mgbe a naghị emepụta carbon dioxide ọzọ, tinye 1.0g nke potassium iodide, mechie ya nke ọma, gbanye ya nke ọma, tinye ya n'ebe gbara ọchịchịrị maka nkeji 5, tinye 1 ml nke starch egosi, titrate na njedebe njedebe na sodium thiosulfate titration. ngwọta (0.02mol/L), ma dekọọ olu eripịara V2 (mL). N'ule ọzọ efu, dekọọ mpịakọta Va na Vb (mL) nke ngwọta titration sodium hydroxide riri (0.02mol/L) na sodium thiosulfate titration solution (0.02mol/L) n'otu n'otu. Gbakọọ ọdịnaya hydroxypropoxyl.
Oge nzipu: Eprel-14-2023