bvunzo nzira
Nzira yezita: hypromellose-kutsunga kweboka re hydroxypropoxy-kutsunga kweboka re hydroxypropoxy
Chiyero chekushandisa: Iyi nzira inoshandisa iyo hydroxypropoxy yekumisikidza nzira kuona zvirimo mu hydroxypropoxy mu hypromellose. Iyi nzira inoshandiswa kune hypromellose.
Nheyo yenzira:calculator thezvemukati zve hydroxypropoxy muchigadzirwa chekuyedza zvinoenderana neiyo hydroxypropoxy yekugadzika nzira.
Reagent:
1. 30% (g/g) chromium trioxide solution
2. Hydrooxide
3. Phenolphthalein chiratidzo chemhinduro
4. Sodium bicarbonate
5. Dilute sulfuric acid
6. Potassium iodide
7. Sodium thiosulfate titration solution (0.02mol/L)
8. Starch chiratidzo mhinduro
midziyo:
Kugadzirira kwemuenzaniso:
1. Sodium hydroxide titration solution (0.02mol/L)
Kugadzirira: Tora 5.6mL ye clear saturated sodium hydroxide solution, wedzera ichangobva kufashaidzwa mvura inotonhora kuti iite 1000mL.
Calibration: Tora inenge 6g ye potassium hydrogen phthalate yakaomeswa pa 105 ° C kuti irambe ichirema, zviyere zvakarurama, wedzera 50mL yemvura inotonhora ichangobva kubikwa, zunza kuti inyunguduke zvakanyanya sezvinobvira; wedzera madonhwe maviri ephenolphthalein chiratidzo chemhinduro, shandisa iyi Liquid titration, kana ichisvika kumagumo, iyo potassium hydrogen phthalate inofanira kunyungudutswa zvachose, uye titrated kusvikira mhinduro yava pink. Yese 1mL ye sodium hydroxide titration solution (1mol/L) yakaenzana ne 20.42mg ye potassium hydrogen phthalate. Verenga huwandu hwemhinduro iyi zvichienderana nekushandiswa kwemhinduro iyi uye huwandu hwe potassium hydrogen phthalate yakatorwa. Kuwedzeredza kashanu kuti ugadzire iyo 0.02mol / L.
Kuchengetedza: Isa mu polyethylene bhodhoro repurasitiki uye uchengetedze rakavharwa; pane maburi maviri mupulagi, uye 1 girazi chubhu inopinzwa mugomba rega rega, 1 chubhu inobatanidzwa nesoda lime chubhu, uye 1 chubhu inoshandiswa kusveta kunze mvura.
2. Phenolphthalein indicator solution Tora 1g ye phenolphthalein, wedzera 100mL ye ethanol kuti inyunguduke.
3. Sodium thiosulfate titration solution (0.02mol/L) Kugadzirira: Tora 26g yesodium thiosulfate uye 0.20g yeanhydrous sodium carbonate, wedzera huwandu hwakakodzera hwemvura inotonhora ichangobva kubikwa kuti inyunguduke mu 1000mL, zunza zvakanaka, uye uiise kwesefa yemwedzi 1. Calibration: tora inenge 0.15g ye potassium dichromate yakaomeswa pa 120 ° C ine uremu hunogara huripo, huremu hwayo, uise mubhodhoro reiodine, wedzera 50mL yemvura kuti iparadze, wedzera 2.0g ye potassium iodide, zunza zvinyoro-nyoro kunyunguduka, wedzera 40mL ye seric acid, tsime sulfure dilute; mushure memaminitsi gumi munzvimbo ine rima, wedzera 250mL yemvura kuti inyunguruke, uye kana mhinduro yacho yaiswa pedyo nekunoperera, wedzera 3mL ye starch indicator solution, ramba uchiita titration kusvika ruvara rwebhuruu rwanyangarika uye rukave girinhi inopenya, uye mhedzisiro yetitration inoshandiswa seyakavharika Muyedzo ruramiso. Yese 1mL yesodium thiosulfate (0.1mol/L) yakaenzana ne4.903g ye potassium dichromate. Verenga huwandu hwemhinduro maererano nekudyiwa kwemushonga uye huwandu hwe potassium dichromate yakatorwa. Kuwedzeredza kashanu kuti ugadzire iyo 0.02mol / L. Kana tembiricha yemukamuri iri pamusoro pe25°C, tembiricha yemushonga wemhinduro uye mvura yedilution inofanira kutonhodzwa kusvika pa20°C.
4. Starch indicator solution Tora 0.5g ye starch yakanyunguduka, uwedzere 5mL yemvura uye funganya zvakanaka, wozodira zvishoma nezvishoma mu 100mL yemvura inopisa, funganisa sezvainowedzerwa, ramba uchibika kwemaminitsi maviri, rega kutonhora, dururira mashura, uye yakagadzirira.
Iyi mhinduro inofanira kugadzirirwa kutsva isati yashandiswa.
Matanho ekushanda: Tora 0.1g yechigadzirwa ichi, chiyera nemazvo, chiise mubhodhoro re distillation D, wedzera 10mL ye30% (g/g) cadmium trichloride solution. Zadza chubhu inogadzira chiutsi B nemvura kujoinhi, uye batanidza iyo distillation unit. Nyura zvose B uye D mukugeza kwemafuta (inogona kunge iri glycerin), ita kuti mvura yekugeza yeoiri ienderane nehuwandu hwemvura yecadmium trichloride solution mubhodhoro D, vhura mvura inotonhorera, uye kana zvichidikanwa, rega rukova rwenitrogen rwuyerere mukati uye kudzora kuyerera kwayo kusvika 1 bubble pasekondi. Mukati maminetsi makumi matatu, simudza tembiricha yekugezera mafuta kusvika 155ºC, uye chengetedza tembiricha iyi kusvika 50 mL ye distillate yaunganidzwa, bvisa condenser chubhu kubva muchikamu chechikamu, sukurudza nemvura, geza uye uise mumhinduro yakaunganidzwa, wedzera madonhwe matatu ephenolphthalein chiratidzo chemhinduro, uye titrate 6 neasidhi 9 pH. mita), rekodha vhoriyamu yakadyiwa V1 (mL), wobva wawedzera 0.5g ye sodium bicarbonate uye 10mL ye dilute sulfuric acid, rega imire kusvika pasisina kabhoni dioxide yagadzirwa, wedzera 1.0g ye potassium iodide, woisa chisimbiso (0.02mol / L) kusvika kumagumo, rekodha vhoriyamu yakadyiwa V2 (mL). Mune imwe bvunzo isina chinhu, rekodha mavhoriyamu Va uye Vb (mL) yeyakadyiwa sodium hydroxide titration solution (0.02mol/L) uye sodium thiosulfate titration solution (0.02mol/L) zvichiteerana.
Nguva yekutumira: Kubvumbi-25-2024