hanyoyin gwaji
Sunan hanya: hypromellose—ƙayyade ƙungiyar hydroxypropoxy—ƙayyade ƙungiyar hydroxypropoxy
Tsarin amfani: Wannan hanyar tana amfani da hanyar tantance hydroxypropoxy don tantance abun da ke cikin hydroxypropoxy a cikin hypromellose. Wannan hanyar ta shafi hypromellose.
Ka'idar hanyar:Lissafaabun ciki na hydroxypropoxy a cikin samfurin gwaji bisa ga hanyar tantance hydroxypropoxy.
Mai hana sake yin amfani da sinadarai:
1. Maganin trioxide na chromium 30% (g/g)
2. Haidroksid
3. Maganin alamar Phenolphthalein
4. Sodium bicarbonate
5. Rage sinadarin sulfuric acid
6. Potassium iodide
7. Maganin sodium thiosulfate na titration (0.02mol/L)
8. Maganin sitaci
kayan aiki:
Samfurin shiri:
1. Maganin titration na sodium hydroxide (0.02mol/L)
Shiri: A sha 5.6mL na ruwan sodium hydroxide mai tsabta, a zuba ruwan sanyi mai zafi sabo don ya zama 1000mL.
Daidaitawa: A ɗauki kimanin gram 6 na potassium hydrogen phthalate da aka busar a 105°C zuwa matsakaicin nauyi, a auna shi daidai, a ƙara 50mL na ruwan sanyi mai sanyi, a girgiza don ya narke gwargwadon iko; a ƙara digo 2 na maganin phenolphthalein, a yi amfani da wannan maganin Liquid titration, lokacin da ya kusanto ƙarshen, ya kamata a narkar da potassium hydrogen phthalate gaba ɗaya, sannan a rage shi har sai maganin ya yi ruwan hoda. Kowane 1mL na maganin sodium hydroxide titration titration (1mol/L) yayi daidai da 20.42mg na potassium hydrogen phthalate. A ƙididdige yawan wannan maganin bisa ga yawan shan wannan maganin da adadin potassium hydrogen phthalate da aka ɗauka. A narkar da shi sau 5 a adadi don ya zama yawan 0.02mol/L.
Ajiya: A saka shi a cikin kwalbar filastik ta polyethylene sannan a rufe shi; akwai ramuka 2 a cikin toshewar, kuma a saka bututun gilashi 1 a cikin kowane rami, a haɗa bututu 1 da bututun lemun tsami na soda, sannan a yi amfani da bututu 1 don tsotsar ruwan.
2. Maganin Phenolphthalein: A ɗauki 1g na phenolphthalein, a ƙara 100mL na ethanol don narkewa.
3. Maganin sodium thiosulfate na titration (0.02mol/L) Shiri: A ɗauki 26g na sodium thiosulfate da 0.20g na sodium carbonate mai ruwa-ruwa, a zuba ruwan sanyi mai tafasa mai kyau don ya narke a cikin 1000mL, a girgiza sosai, sannan a ajiye shi na tsawon wata 1. Daidaitawa: a ɗauki kimanin 0.15g na potassium dichromate na yau da kullun da aka busar a 120°C tare da nauyin da ya dace, a auna shi daidai, a saka shi a cikin kwalban iodine, a ƙara 50mL na ruwa don narke, a ƙara 2.0g na potassium iodide, a girgiza a hankali don narke, a ƙara 40mL na acid sulfuric mai narkewa, A girgiza sosai a rufe sosai; bayan mintuna 10 a wuri mai duhu, a ƙara 250mL na ruwa don narke, kuma lokacin da aka narke maganin zuwa kusa da wurin ƙarshe, a ƙara 3mL na maganin sitaci, a ci gaba da narkewa har sai launin shuɗi ya ɓace ya zama kore mai haske, kuma ana amfani da sakamakon narkewa azaman gyaran gwaji mara komai. Kowace 1mL na sodium thiosulfate (0.1mol/L) daidai take da 4.903g na potassium dichromate. Lissafa yawan maganin gwargwadon yawan shan maganin da adadin potassium dichromate da aka ɗauka. A narke shi sau 5 a adadi kaɗan don ya zama 0.02mol/L. Idan zafin ɗakin ya wuce 25°C, ya kamata a sanyaya zafin maganin amsawar da ruwan narkewar ya zuwa kusan 20°C.
4. Maganin sitaci: A ɗauki sitaci mai narkewa 0.5g, a zuba ruwa 5ml a gauraya sosai, sannan a zuba a hankali a cikin ruwan zãfi 100ml, a gauraya yayin da ake ƙarawa, a ci gaba da tafasa na minti 2, a bar shi ya huce, a zuba ruwan da ke cikinsa, sannan ya shirya.
Ya kamata a shirya wannan maganin sabo kafin amfani.
Matakan Aiki: Ɗauki 0.1g na wannan samfurin, auna shi daidai, saka shi a cikin kwalbar distillation D, ƙara 10mL na maganin cadmium trichloride 30% (g/g). Cika bututun samar da tururi B da ruwa zuwa ga haɗin, sannan a haɗa na'urar distillation. A nutsar da B da D a cikin baho mai (zai iya zama glycerin), a sa matakin ruwan baho na mai ya yi daidai da matakin ruwan maganin cadmium trichloride a cikin kwalbar D, a kunna ruwan sanyaya, kuma idan ya cancanta, a bar rafin nitrogen ya shiga kuma a sarrafa yawan kwarararsa zuwa kumfa 1 a kowace daƙiƙa. A cikin mintuna 30, a ɗaga zafin mai a cikin bahon mai zuwa 155ºC, sannan a kiyaye wannan zafin har sai an tattara 50 mL na distillate, a cire bututun mai daga ginshiƙin rabawa, a kurkure da ruwa, a wanke a haɗa a cikin maganin da aka tattara, a ƙara digo 3 na maganin phenolphthalein, sannan a rage shi zuwa ƙimar pH shine 6.9-7.1 (an auna shi da mitar acidity), a rubuta girman da aka cinye V1 (mL), sannan a ƙara 0.5g na sodium bicarbonate da 10mL na diluted sulfuric acid, a bar shi ya tsaya har sai ba a sake samar da carbon dioxide ba, a ƙara 1.0g na potassium iodide, a rufe shi. A girgiza sosai, a sanya a cikin duhu na tsawon mintuna 5, a ƙara 1mL na maganin sitaci, a rage shi da maganin sodium thiosulfate titration (0.02mol/L) zuwa ƙarshen wurin, a rubuta girman da aka cinye V2 (mL). A wani gwajin da ba komai a ciki, rubuta adadin Va da Vb (mL) na maganin sodium hydroxide da aka sha (0.02mol/L) da kuma maganin sodium thiosulfate titration (0.02mol/L) bi da bi.
Lokacin Saƙo: Afrilu-25-2024