Sunan hanyar: hypromellose - ƙaddarar hydroxypropoxy - ƙaddarar hydroxypropoxy
Iyakar aikace-aikace: Wannan hanyar tana amfani da hanyar tantance hydroxypropoxy don tantance abun ciki na hydroxypropoxy a cikin hypromellose.
Wannan hanya tana amfani da hypromellose.
Ƙa'idar hanyar: Lissafin abun ciki na hydroxypropoxy a cikin samfurin gwaji bisa ga hanyar tantance hydroxypropoxy.
Reagent:
1. 30% (g/g) chromium trioxide bayani
2. Sodium hydroxide titration bayani (0.02mol/L)
3. Phenolphthalein nuna alama bayani
4. Sodium bicarbonate
5. Tsarma sulfuric acid
6. Potassium iodide
7. Sodium thiosulfate titration bayani (0.02mol/L)
8. Sitaci bayani bayani
kayan aiki:
Shirye-shiryen samfur: 1. Sodium hydroxide titration bayani (0.02mol/L)
Shiri: Ɗauki 5.6mL na bayani mai cikakken bayani na sodium hydroxide, ƙara sabon ruwan sanyi da aka dafa don yin 1000ml.
Calibration: Ɗauki kimanin 6g na daidaitaccen potassium hydrogen phthalate wanda aka bushe a 105 ° C zuwa nauyi akai-akai, auna shi daidai, ƙara 50mL na ruwan sanyi da aka tafasa, girgiza don ya narkar da shi sosai; ƙara 2 saukad da na phenolphthalein nuna alama bayani, yi amfani da wannan Liquid titration, lokacin da gabatowa karshen batu, da potassium hydrogen phthalate ya kamata a narkar da gaba daya, da titrated har sai da bayani ya zama ruwan hoda. Kowane 1ml na sodium hydroxide titration bayani (1mol/L) yayi daidai da 20.42mg na potassium hydrogen phthalate. Yi ƙididdige yawan adadin wannan maganin dangane da amfani da wannan maganin da adadin potassium hydrogen phthalate da aka ɗauka. A juye juye sau 5 don yin taro 0.02mol/L.
Adana: Saka shi a cikin kwalban filastik polyethylene kuma kiyaye shi a rufe; akwai ramuka 2 a cikin filogi, kuma ana saka bututun gilashi 1 a cikin kowane rami, ana haɗa bututu 1 tare da bututun lemun tsami, kuma ana amfani da bututu 1 don tsotse ruwan.
2. Phenolphthalein nuna alama bayani
Ɗauki 1 g na phenolphthalein, ƙara 100ml na ethanol don narkewa.
3. Sodium thiosulfate titration bayani (0.02mol/L)
Shiri: Ɗauki 26g na sodium thiosulfate da 0.20g na anhydrous sodium carbonate, ƙara daidai adadin ruwan sanyi da aka tafasa don narke cikin 1000ml, girgiza da kyau, sannan a tace bayan tsayawa na wata 1.
Calibration: a dauki kimanin 0.15g na daidaitaccen potassium dichromate da aka bushe a 120 ° C tare da nauyi akai-akai, daidai gwargwado, saka shi a cikin kwalban iodine, ƙara 50mL na ruwa don narkewa, ƙara 2.0g na potassium iodide, girgiza a hankali don narke, ƙara. 40 ml na tsarma sulfuric acid, girgiza da kyau kuma rufe sosai; Bayan minti 10 a wuri mai duhu, ƙara 250mL na ruwa don tsarma, kuma idan an titrate maganin zuwa kusa da ƙarshen ƙarshen, ƙara 3ml na maganin sitaci, ci gaba da titration har sai launin shuɗi ya ɓace ya zama kore mai haske, kuma sakamakon titration. ana amfani dashi azaman gyaran gwaji mara komai. Kowane 1 ml na sodium thiosulfate (0.1mol/L) yayi daidai da 4.903g na potassium dichromate. Yi ƙididdige ƙididdiga na maganin gwargwadon amfani da maganin da adadin potassium dichromate da aka ɗauka. A juye juye sau 5 don yin taro 0.02mol/L.
Idan dakin zafin jiki ya wuce 25 ° C, zazzabi na maganin amsawa da ruwa mai narkewa ya kamata a sanyaya zuwa kimanin 20 ° C.
4. Sitaci bayani bayani
Sai ki samu 0.5g na sitaci mai soluble sai ki zuba 5mL na ruwa ki jujjuya sosai, sai ki zuba a cikin ruwan tafasasshen 100mL, ki jujjuya, ki ci gaba da tafasawa na tsawon minti 2, sai ki sauke, ki sauke, sai ki samu. Wannan bayani ya kamata a shirya sabo kafin amfani.
Matakan aiki: Ɗauki 0.1g na wannan samfurin, auna shi daidai, saka shi a cikin kwalban distillation D, ƙara 10mL na 30% (g/g) cadmium trichloride bayani. Cika bututun da ke samar da tururi B da ruwa zuwa haɗin gwiwa, kuma haɗa sashin distillation. Sanya duka B da D a cikin wanka mai mai (zai iya zama glycerin), sanya matakin ruwa na wanka mai daidai da matakin ruwa na maganin cadmium trichloride a cikin kwalban D, kunna ruwan sanyi, kuma idan ya cancanta, bari. rafin nitrogen yana gudana kuma yana sarrafa ƙimarsa zuwa kumfa 1 a sakan daya. A cikin minti 30, ƙara yawan zafin jiki na wanka mai mai zuwa 155ºC, kuma kula da wannan zafin jiki har sai an tattara 50 ml na distillate, cire bututun na'ura daga sashin juzu'i, kurkura da ruwa, wanke da haɗuwa cikin ruwan da aka tattara, ƙara 3. saukad da phenolphthalein bayani bayani, da kuma amfani da Titrate har sai da pH darajar ne 6.9-7.1 (auna tare da wani acidity mita), rikodin cinye cinye V1 (mL), sa'an nan ƙara 0.5g na sodium bicarbonate da 10mL na tsarma sulfuric acid, bar shi. tsaya har sai an daina samar da carbon dioxide, ƙara 1.0g na potassium iodide, Rufe shi da kyau, girgiza shi da kyau, sanya shi a wuri mai duhu don minti 5, ƙara 1 ml na sitaci mai nuna alama, titrate zuwa ƙarshen ƙarshen tare da sodium thiosulfate titration. bayani (0.02mol/L), da rikodin ƙarar da aka cinye V2 (mL). A wani gwajin mara komai, yi rikodin kundin Va da Vb (mL) na maganin titration sodium hydroxide da aka cinye (0.02mol/L) da maganin titration sodium thiosulfate (0.02mol/L) bi da bi. Yi lissafin abun ciki na hydroxypropoxyl.
Lokacin aikawa: Afrilu-14-2023