ụzọ nnwale
Aha usoro: hypromellose—mkpebi nke otu hydroxypropoxy—mkpebi nke otu hydroxypropoxy
Oke ojiji: Usoro a na-eji usoro mkpebi hydroxypropoxy iji chọpụta ọdịnaya nke hydroxypropoxy na hypromellose. Usoro a dabara na hypromellose.
Ụkpụrụ nke usoro ahụ:Gbakọọ Gbakọọọdịnaya nke hydroxypropoxy na ngwaahịa nnwale dịka usoro mkpebi hydroxypropoxy si dị.
Ihe na-eme ka ihe ... ghara ịdị mma:
1. 30% (g/g) ngwakọta chromium trioxide
2. Haịdrọksịd
3. Ngwọta ihe ngosi Phenolphthalein
4. Sodium bicarbonate
5. Gwakọta asịd sulfuric
6. Potassium iodide
7. Sodium thiosulfate titration solution (0.02mol/L)
8. Ngwọta ihe ngosi starch
akụrụngwa:
Nkwadebe ihe atụ:
1. Mmiri titration sodium hydroxide (0.02mol/L)
Nkwadebe: Were 5.6mL nke mmiri sodium hydroxide doro anya, tinye mmiri oyi esi ọhụrụ ka ọ bụrụ 1000mL.
Nhazi: Were ihe dị ka 6g nke potassium hydrogen phthalate a kpọrọ nkụ na 105°C ruo n'ịdị arọ na-adịgide adịgide, tụọ ya nke ọma, tinye 50mL nke mmiri oyi a na-esi ọhụrụ esi, maa jijiji ka ọ gbazee dịka o kwere mee; tinye ntapụ abụọ nke ihe ngosi phenolphthalein, jiri titration mmiri a, mgbe ọ na-eru nso ebe njedebe, a ga-agbaze potassium hydrogen phthalate kpamkpam, ma titration ruo mgbe ngwọta ahụ ga-aghọ pink. 1mL nke sodium hydroxide titration solution (1mol/L) ọ bụla hà nhata 20.42mg nke potassium hydrogen phthalate. Gbakọọ mkpokọta nke ngwọta a dabere na oriri nke ngwọta a na ọnụọgụ potassium hydrogen phthalate e were. Gbakọọ ya ugboro ise iji mee ka ntinye ahụ bụrụ 0.02mol/L.
Nchekwa: Tinye ya n'ime karama plastik polyethylene ma mechie ya; enwere oghere abụọ n'ime plọg ahụ, a na-etinyekwa otu tube iko n'ime oghere ọ bụla, a na-ejikọ otu tube na soda lime tube, a na-ejikwa otu tube maka ịmịpụta mmiri mmiri ahụ.
2. Ihe ngosi Phenolphthalein Were 1g nke phenolphthalein, tinye 100mL nke ethanol iji gbazee
3. Sodium thiosulfate titration solution (0.02mol/L) Nkwadebe: Were 26g nke sodium thiosulfate na 0.20g nke sodium carbonate anhydrous, tinye mmiri oyi e siri esi nke ọma 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 a kpọrọ nkụ na 120°C na ibu dị arọ mgbe niile, tụọ ya nke ọma, tinye ya n'ime karama iodine, tinye 50mL mmiri ka ọ gbazee, tinye 2.0g nke potassium iodide, maa jijiji nwayọ ka ọ gbazee, tinye 40mL nke sulfuric acid a gwakọtara agwakọta, Ma jijiji nke ọma ma mechie nke ọma; mgbe nkeji iri gachara n'ebe gbara ọchịchịrị, tinye 250mL mmiri ka ọ gbazee, mgbe a tụbara mmiri ahụ ruo nso ebe njedebe, tinye 3mL nke mmiri starch na-egosi, gaa n'ihu na titration ruo mgbe agba anụnụ anụnụ ahụ ga-apụ n'anya ma ghọọ akwụkwọ ndụ akwụkwọ ndụ na-egbuke egbuke, a na-ejikwa nsonaazụ titration dị ka ndozi nnwale efu. 1mL nke sodium thiosulfate (0.1mol/L) ọ bụla bụ 4.903g nke potassium dichromate. Gbakọọ mkpokọta nke ngwọta ahụ dịka oriri nke ngwọta ahụ na ọnụọgụ potassium dichromate e were si dị. Gbakọọ ya ugboro ise iji mee ka mkpokọta ahụ bụrụ 0.02mol/L. Ọ bụrụ na okpomọkụ ụlọ ahụ karịrị 25°C, a ga-ajụ oyi okpomọkụ nke ngwọta mmeghachi omume na mmiri dilution ruo ihe dị ka 20°C.
4. Ihe ngwọta nke ihe ngosi starch. Were 0.5g nke starch na-agbaze agbaze, tinye 5mL mmiri ma gwakọta nke ọma, wee wụsa nwayọ nwayọ n'ime 100mL mmiri ọkụ, gwakọta ka a na-etinye ya, nọgide na-esi ya ruo nkeji abụọ, hapụ ya ka ọ dị jụụ, wụsa ihe na-esi n'elu ya, ọ dịkwa njikere.
A ga-akwadebe ihe ngwọta a ọhụrụ tupu e jiri 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. Jupụta tube na-emepụta uzuoku B na mmiri na nkwonkwo ahụ, ma jikọọ unit distillation ahụ. Mikpuo ma B na D n'ime bat mmanụ (ọ nwere ike ịbụ glycerin), mee ka ọkwa mmiri nke bat mmanụ ahụ kwekọọ na ọkwa mmiri nke ngwọta cadmium trichloride n'ime karama D, gbanye mmiri oyi, ma ọ bụrụ na ọ dị mkpa, hapụ mmiri nitrogen ka ọ banye ma jikwaa ọnụego mmiri ya ruo 1 afụ kwa sekọnd. N'ime nkeji iri atọ, bulie okpomọkụ nke bat mmanụ ahụ ruo 155ºC, ma nọgide na-enwe okpomọkụ a ruo mgbe 50 mL nke distillate ga-achịkọta, wepụ tube condenser na kọlụm nkewa, sachaa ya na mmiri, saa ya ma tinye ya na ngwọta a nakọtara, tinye ntapụ atọ nke ihe ngosi phenolphthalein, wee titrate ya na uru pH bụ 6.9-7.1 (a tụrụ ya na mita acidity), dekọọ olu e riri V1 (mL), wee tinye 0.5g nke sodium bicarbonate na 10mL nke acid sulfuric diluted, hapụ ya ka ọ kwụgide ruo mgbe a naghị emepụta carbon dioxide ọzọ, tinye 1.0g nke potassium iodide, ma mechie ya. Ma jijiji nke ọma, tinye ya n'ọchịchịrị maka nkeji ise, tinye 1mL nke ihe ngosi starch, titrate ya na sodium thiosulfate titration solution (0.02mol/L) na njedebe, dekọọ olu e riri V2 (mL). N'ule ọzọ efu, dekọọ olu Va na Vb (mL) nke ngwọta sodium hydroxide titration (0.02mol/L) na ngwọta sodium thiosulfate titration (0.02mol/L) n'otu n'otu.
Oge ozi: Eprel-25-2024