hanyoyin gwaji
Sunan hanyar: hypromellose - ƙayyadaddun ƙungiyar hydroxypropoxy - ƙayyadaddun ƙungiyar 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.
Ka'idar hanyar:Yi lissafinabun ciki na hydroxypropoxy a cikin samfurin gwaji bisa ga hanyar tantance hydroxypropoxy.
Reagent:
1. 30% (g/g) chromium trioxide bayani
2. Hydroxide
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:
Misali shiri:
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 bisa ga 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. Maganin alamar Phenolphthalein Ɗauki 1g 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 sabo da tafasa don narke cikin 1000mL, girgiza da kyau, sa'annan a ajiye shi tsawon wata 1. Calibration: Ɗauki kimanin 0.15g na daidaitaccen potassium dichromate bushe a 120 ° C tare da nauyi akai-akai, daidai auna shi, saka shi a cikin kwalban iodine, ƙara 50ml na ruwa don narkewa, ƙara 2.0g na potassium iodide, girgiza a hankali don narke, ƙara 40ml na dilute sulfuric acid, girgiza da kyau kuma a rufe. 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 ana amfani da sakamakon titration azaman gyaran gwaji mara kyau. Kowane 1 ml na sodium thiosulfate (0.1mol/L) yayi daidai da 4.903g na potassium dichromate. Yi ƙididdige yawan adadin maganin bisa ga yawan 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. Maganin sitaci sai a samu sitaci 0.5g na ruwa mai soluble a zuba 5mL na ruwa a juye sosai, sai a zuba a cikin tafasasshen ruwa 100mL a hankali, sai a kara dahuwa, sai a ci gaba da tafasawa na tsawon mintuna 2, sai a sauke, sai a zuba ruwan sama, sai a shirya.
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. Zuba 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 sanyaya, kuma idan ya cancanta, bari rafin nitrogen ya gudana kuma ya sarrafa ƙimarsa zuwa kumfa 1 a sakan daya. A cikin minti 30, tada yawan zafin jiki na wanka mai man fetur zuwa 155ºC, da kuma kula da wannan zafin jiki har sai an tattara 50 ml na distillate, cire tube na condenser daga ginshiƙan raguwa, wanke da ruwa, wanke da kuma shigar da shi a cikin maganin da aka tattara, ƙara 3 saukad da na phenolphthalein nuna alama, da kuma titrate tare da wani acid p.9. meter), rubuta ƙarar cinyewa V1 (mL), sa'an nan kuma ƙara 0.5g na sodium bicarbonate da 10mL na dilute sulfuric acid, bar shi tsaye har sai an daina samar da carbon dioxide, ƙara 1.0g na potassium iodide, da kuma rufe shi, girgiza da kyau, sanya a cikin duhu na minti 5, ƙara 1mL na sitaci nuna alama bayani, titrate 0 sodium titrate da sodium titrate. ƙarshen batu, yi 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.
Lokacin aikawa: Afrilu-25-2024