Magaca habka: hypromellose - go'aaminta hydroxypropoxy - go'aaminta hydroxypropoxy
Baaxadda codsiga: Habkani wuxuu isticmaalaa habka go'aaminta hydroxypropoxy si loo go'aamiyo waxa ku jira hydroxypropoxy ee hypromellose.
Habkani wuxuu khuseeyaa hypromellose.
Mabda'a habka: Xisaabi waxa ku jira hydroxypropoxy ee alaabta tijaabada iyadoo loo eegayo habka go'aaminta hydroxypropoxy.
Reagent:
1. 30% (g/g) chromium trioxide xal
2. Sodium hydroxide titration xal (0.02mol/L)
3. Xalka tilmaame Phenolphthalein
4. Sodium bicarbonate
5. Ku qas sulfuric acid
6. Potassium iodide
7. Sodium thiosulfate titration xal (0.02mol/L)
8. Xalka tilmaamaya istaarijka
qalabka:
Tusaalaha diyaarinta: 1. Sodium hydroxide titration solution (0.02mol/L)
Diyaarinta: Qaado 5.6mL oo saafi ah sodium hydroxide xal, ku dar biyo qabow oo cusub oo la karkariyey si aad uga dhigto 1000ml.
Cabbiridda: Qaado qiyaastii 6g oo ah potassium hydrogen phthalate caadiga ah oo la qalajiyey 105 ° C si aad u miisaan joogto ah, si sax ah u miisaan, ku dar 50mL oo biyo qabow oo cusub la karkariyey, rux si ay u milmaan intii suurtogal ah; ku dar 2 dhibcood oo ah xalka phenolphthalein, isticmaal titration-kan dareeraha ah, marka aad soo dhawaato barta ugu dambeysa, potassium hydrogen phthalate waa in si buuxda loo milmaa, oo titrated ilaa xalku noqdo casaan. 1ml kasta oo ah sodium hydroxide titration solution (1mol/L) waxay u dhigantaa 20.42mg oo ah phthalate potassium hydrogen. Xisaabi inta uu le'eg yahay xalkan iyada oo ku saleysan isticmaalka xalkan iyo xaddiga potassium hydrogen phthalate ee la qaatay. Tiro ahaan u milo 5 jeer si aad uga dhigto fiirsashada 0.02mol/L.
Kaydinta: Ku rid dhalo caag ah oo polyetylen ah oo ku dheji; 2 dalool baa furka ku jira, dalool kastana 1 tuubbo oo galaas ah ayaa la geliyaa, 1 tuubbo waxa lagu xidhay tuubada lime soodhaha, 1 tuubbo ayaa loo isticmaalaa in lagu nuugo dareeraha.
2. Phenolphthalein tilmaame xal
Qaado 1 g oo ah phenolphthalein, ku dar 100mL oo ethanol ah si aad u milmaan
3. Sodium thiosulfate titration xal (0.02mol/L)
Diyaarinta: Qaado 26g oo sodium thiosulfate ah iyo 0.20g oo ah sodium carbonate anhydrous, ku dar qadar ku habboon oo biyo qabow oo cusub la karkariyey si aad ugu milmaan 1000ml, si fiican u rux, oo shaandhayso ka dib markaad istaagto 1 bil.
Cabbiridda: qaado qiyaastii 0.15g oo ah potassium dichromate caadiga ah oo la qalajiyey 120 ° C oo leh miisaan joogto ah, si sax ah u miisaan, ku rid dhalada iodine, ku dar 50mL oo biyo ah si ay u milmaan, ku dar 2.0g of potassium iodide, si tartiib ah u rux si ay u milmaan, ku dar 40 ml oo ah sulfuric acid, si fiican u rux oo si adag u xidh; 10 daqiiqo ka dib meel mugdi ah, ku dar 250mL oo biyo ah si aad u milmaan, iyo marka xalka la titrate meel u dhow barta dhamaadka, ku dar 3ml of istaarijka xal, sii wad titration ilaa midabka buluuga ah ka ba'o oo uu noqdo cagaar dhalaalaya, iyo natiijada titration. waxa loo istcimaalayaa sixid tijaabo ah oo maran. 1 ml kasta oo sodium thiosulfate ah (0.1mol/L) waxa ay u dhigantaa 4.903g oo potassium dichromate ah. Xisaabi inta uu le'eg yahay xalka iyadoo loo eegayo isticmaalka xalka iyo xaddiga potassium dichromate ee la qaatay. Si tiro yar u milo 5 jeer si aad uga dhigto fiirsashada 0.02mol/L.
Haddii heerkulka qolku ka sarreeyo 25 ° C, heerkulka xalalka falcelinta iyo biyaha milanka waa in la qaboojiyo ilaa 20 ° C.
4. Xalka tilmaamayaasha istaarijka
Qaado 0.5g oo istaarij ah oo milmaya, ku dar 5mL oo biyo ah si fiican u walaaq,kadib aayar ku shub 100mL oo biyo ah karkaraya,waji intaad ku darayso, sii wad karkari 2daqiiqo,is qabooji,ku shub biyaha sare,waana aad helaysaa. Xalkan waa in si cusub loo diyaariyaa ka hor inta aan la isticmaalin.
Tillaabooyinka hawlgalka: Qaado 0.1g oo alaabtan ah, si sax ah u miisaamee, ku rid dhalada distillation D, ku dar 10mL oo ah 30% (g/g) cadmium trichloride xal. Ku buuxi tuubada uumiga B ee biyaha isku xidhka, oo ku xidh unugga wax ka saara. Ku rid labada B iyo D ee qubeyska saliidda (waxay noqon kartaa glycerin), samee heerka dareeraha ee saliidda qubeyska si waafaqsan heerka dareeraha ee xalka trichloride cadmium ee dhalada D, shid biyaha qaboojinta, iyo haddii loo baahdo, ha qulqulka nitrogen-ka ayaa gudaha u gala oo xakameeya qulqulkiisa ilaa 1 xumbo ilbiriqsikii. 30 daqiiqo gudahood, kor u qaad heerkulka qubeyska saliidda ilaa 155ºC, oo ku ilaali heerkulkan ilaa 50 mL oo distillate ah la ururiyo, ka saar tuubada kondenserka ee tiirka jajabka, biyo raaci biyo, ku dhaq oo ku dar dareeraha la ururiyey, ku dar 3 Dhibcaha phenolphthalein xalalka, isticmaal Titrate ilaa qiimaha pH uu yahay 6.9-7.1 (oo lagu qiyaasay mitirka aashitada), ku qor mugga la isticmaalo V1 (mL), ka dibna ku dar 0.5g ee sodium bicarbonate iyo 10mL oo ah sulfuric acid walaaq, u daa. istaag ilaa aan la soo saarin kaarboon laba ogsaydh, ku dar 1.0g oo potassium iodide ah, si adag u xidh, si fiican u rux, ku rid meel mugdi ah 5 daqiiqo, ku dar 1mL oo ah xal tusaha istaarijka, titrate ilaa meesha ugu dambaysa ee titration sodium thiosulfate xal (0.02mol/L), oo duub mugga la isticmaalay V2 (ml). Tijaabo kale oo madhan, ku qor mugga Va iyo Vb (mL) ee xalalka titration sodium hydroxide ee la cunay (0.02mol/L) iyo sodium thiosulfate titration solution (0.02mol/L) siday u kala horreeyaan. Xisaabi waxa ku jira hydroxypropoxyl.
Waqtiga boostada: Abriil-14-2023