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, ma tinye ya maka nzacha ọnwa 1. 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 ayodiin, tinye 50ml mmiri ka ọ gbazee, gbakwunye 2.0g nke potassium iodide, gbazee nwayọ ka ọ gbazee, gbakwunye 40ml nke itughari sulfuric acid, gbanye nke ọma na mechie ya. Mgbe nkeji 10 gachara n'ebe gbara ọchịchịrị, gbakwunye 250mL mmiri ka ọ gbazee, ma mgbe a na-edozi ngwọta ahụ na nso njedebe njedebe, gbakwunye 3mL nke ihe ngosi starch, nọgide na-agbanye ruo mgbe agba anụnụ anụnụ na-apụ n'anya ma ghọọ akwụkwọ ndụ akwụkwọ ndụ na-egbuke egbuke, a na-eji nsonaazụ titration mee ihe dị ka mgbazi ule 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-akpali nke ọma, wee jiri nwayọọ nwayọọ wụsa n'ime 100mL nke esi mmiri, bilie ka ọ na-agbakwunyere, nọgide na-esi nri maka nkeji 2, hapụ jụụ, wụsa supernatant, na ọ dị 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 kwekọrọ na ọkwa mmiri nke cadmium trichloride solution na karama D, gbanye mmiri jụrụ oyi, ma ọ bụrụ na ọ dị mkpa, ka mmiri nitrogen na-abanye ma na-achịkwa ọnụego ya na 1 afụ kwa nkeji. N'ime nkeji 30, bulie okpomọkụ nke mmanụ bat na 155ºC, ma nọgide na-enwe okpomọkụ a ruo mgbe 50 ml nke distillate na-anakọta, wepụ ihe condenser tube si na fractionation kọlụm, itucha na mmiri, na-asacha na itinye n'ime ihe ngwọta anakọtara, tinye 3 tụlee nke phenolphthalein egosi ngwọta, na titrate bụ 6 acid ngwọta na p.9. mita), dekọọ iwesa olu V1 (mL), wee tinye 0.5g nke sodium bicarbonate na 10mL nke dilute sulfuric acid, ka o guzo ruo mgbe ọzọ carbon dioxide na-emepụta, tinye 1.0g nke potassium iodide, na mechie ya, maa jijiji nke ọma, tinye n'ime ọchịchịrị maka nkeji 5, tinye 1mL nke starch egosi ngwọta, titrate titrate na sodium/0L ngwọta. 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