ule ụzọ
Aha usoro: hypromellose - mkpebi siri ike nke otu hydroxypropoxy - mkpebi siri ike nke otu 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 iheọdịnaya nke hydroxypropoxy n'ime ngwaahịa nnwale dịka usoro mkpebi hydroxypropoxy siri dị.
Reagent:
1. 30% (g/g) chromium trioxide ngwọta
2. Hydroxide
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 ihe atụ:
1. Sodium hydroxide titration ngwọta (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 1g nke phenolphthalein, tinye 100mL nke ethanol ka igbari
3. Sodium thiosulfate titration solution (0.02mol/L) Nkwadebe: Were 26g sodium thiosulfate na 0.20g nke anhydrous sodium carbonate, tinye ihe kwesịrị ekwesị nke mmiri oyi sie ọhụrụ ka ọ gbazee n'ime 1000mL, maa jijiji nke ọma, tinye ya maka ọnwa 1. nyo. 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 mmezi 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 soluble starch, tinye 5mL mmiri na nwuo nke ọma, wee jiri nwayọọ nwayọọ wụsa n'ime 100mL nke esi mmiri, bilie ka ọ na-agbakwunyere, nọgide na-esi nri maka 2 nkeji, ka jụụ, wunye supernatant, ma ọ dịla njikere.
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 ịgbasa ya ruo 1 afụ kwa sekọnd. N'ime nkeji 30, bulie okpomọkụ nke mmanụ bat na 155ºC, ma nọgide na-enwe okpomọkụ ruo mgbe a na-anakọta 50 ml nke distillate, wepụ tube condenser site na kọlụm fractionation, kpochaa ya na mmiri, saa ma tinye ya na ngwọta anakọtara, tinye 3. tụlee nke phenolphthalein egosi ngwọta, na titrate na pH uru bụ 6.9-7.1 (jiri acidity tụrụ). mita), dekọọ olu erimeri V1 (mL), wee tinye 0.5g nke sodium bicarbonate na 10mL nke dilute sulfuric acid, hapụ ya ka ọ guzo ruo mgbe a na-emepụta carbon dioxide ọzọ, tinye 1.0g nke potassium iodide, ma mechie ya, gbasie nke ọma. , Tinye n'ime ọchịchịrị maka nkeji 5, tinye 1mL nke ihe ngosi starch, titrate na sodium thiosulfate titration solution (0.02mol/L) ka N'ọgwụgwụ, dekọọ olu e riri 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.
Oge nzipu: Eprel-25-2024