tikanga whakamatautau
Ingoa tikanga: hypromellose—te whakatau i te roopu hydroxypropoxy—te whakatau i te roopu hydroxypropoxy
Te whānuitanga o te tono: Ka whakamahia e tenei tikanga te tikanga whakatau hydroxypropoxy hei whakatau i te ihirangi o te hydroxypropoxy i roto i te hypromellose. Ko tenei tikanga e pa ana ki te hypromellose.
Tikanga o te tikanga:Tātaihia tete ihirangi o te hydroxypropoxy i roto i te hua whakamatautau kia rite ki te tikanga whakatau hydroxypropoxy.
Reagent:
1. 30% (g/g) chromium trioxide otinga
2. Waiwai
3. Te otinga tohu Phenolphthalein
4. konutai bicarbonate
5. Waimeha waikawa pungatara
6. Te pāhare pāporo iodide
7. Wairewa titration konutai thiosulfate (0.02mol/L)
8. Te otinga tohu maaka
taputapu:
Whakaritenga tauira:
1. Te wairewa tairitenga konutai konutai (0.02mol/L)
Te Whakaritenga: Tangohia te 5.6mL o te wairewa konutai waiwaro maamaa kukū, tāpirihia he wai matao hou kohuatia kia 1000mL.
Te whakatikatika: Me tango kia 6 karamu o te pāhare pāporo hauwai phthalate kua whakamarokehia ki te 105°C ki te taumaha tonu, paunatia tika, tāpirihia te 50mL o te wai makariri kātahi anō ka kohuatia, ruru kia memeha noa; tāpirihia kia 2 ngā pata o te wairewa tohu phenolphthalein, whakamahia tenei titration Wai, ka tata ki te pito mutunga, me tino rewa te konupora hydrogen phthalate, ka titrated kia mawhero te otinga. Ia 1mL o te konutai wairewa wairewa titration (1mol/L) he rite ki te 20.42mg o te konutai hauwai phthalate. Tātaihia te kukū o tēnei otinga i runga i te kai o tēnei otinga me te nui o te pāhare pāporo hauwai phthalate i tangohia. Me waimeha ine kia 5 nga wa kia 0.02mol/L te kukū.
Rokiroki: Whakanohoia ki roto i te pounamu kirihou polyethylene ka hiritia; E 2 nga kohao o te mono, ka kuhuhia kia 1 ngongo karaihe ki ia kohao, 1 ngongo ka honoa ki te ngongo houra kotakota, ka whakamahia kia 1 ngongo mo te ngote i te wai.
2. Te wairewa tohu Phenolphthalein Tangohia kia 1 karamu o te phenolphthalein, tāpirihia te 100mL o te waihā kia memeha
3. Wairewa titration konutai thiosulfate (0.02mol/L) Te Whakaritenga: Tangohia te 26g o te konutai thiosulfate me te 0.20g o te konutai warowaikawa anhydrous, tāpirihia he wai matao katahi ano ka kohuatia kia rewa ki te 1000mL, ruru pai, waiho mo te 1 marama tātari. Whakariterite: tangohia kia 0.15 karamu o te pāhare pāporo dichromate kua whakamarokehia ki te 120°C me te taumaha tonu, kia tika te pauna, hoatu ki roto i te pounamu iodine, tāpirihia te 50mL wai kia memeha, tāpirihia te 2.0g pāhare pāporo iodide, ruru ata kia memeha, tāpirihia 40mL o te waikawa pungatara waimeha, ruru pai ka hiritia; i muri i te 10 meneti i roto i te waahi pouri, taapirihia he 250mL wai kia waimeha, a ka taia te wairewa ki te tata ki te pito mutunga, taapirihia te 3mL o te wairewa tohu maaka, haere tonu te titrate tae noa ki te ngaro o te tae kahurangi ka kakariki kanapa, ka puta te hua. ka whakamahia hei whakatikatika Whakamaatau. Ko ia 1mL o te konutai thiosulfate (0.1mol/L) he rite ki te 4.903g o te konutai dichromate. Tātaihia te kukū o te otinga i runga i te kai o te otinga me te nui o te pāhare pāporo dichromate i tangohia. Me waimeha ine kia 5 nga wa kia 0.02mol/L te kukū. Mena kei runga ake te pāmahana rūma i te 25°C, me whakamatao te pāmahana o te otinga tauhohenga me te wai waimeha ki te 20°C.
4. Wairewa tohu māngaro Tangohia te 0.5g o te māngaro wairewa, tāpirihia te 5mL o te wai ka kōrori pai, kātahi ka āta ringihia ki roto ki te 100mL o te wai koropupū, whakaohokia i te mea kua tāpirihia, kia korohū tonu mo te 2 meneti, kia whakamatao, kia ringihia te supernatant, a kua rite.
Me whakarite hou tenei otinga i mua i te whakamahi.
Nga mahi: Tangohia te 0.1g o tenei hua, ka ata paunatia, ka maka ki roto i te pounamu D, ka tapirihia he 10mL o te 30% (g/g) otinga cadmium trichloride. Whakakiia te ngongo whakangao mamaoa B ki te wai ki te hononga, ka honoa te wae whakangao. Rukuhia te B me te D ki roto i te pati hinu (ka taea te glycerin), kia rite te taumata wai o te pati hinu ki te taumata wai o te otinga cadmium trichloride i roto i te pounamu D, whakakāhia te wai whakamatao, a ki te tika, waiho ka rere te awa hauota ki roto, ka whakahaere i tana tere rere ki te 1 mirumiru ia hekona. I roto i te 30 meneti, whakanekehia te mahana o te pati hinu ki te 155ºC, ka pupuri i tenei pāmahana kia kohia te 50 mL o te distillate, tangohia te ngongo condenser mai i te wahanga hautau, horoia ki te wai, horoi me te whakauru ki roto i te otinga kua kohia, tāpirihia te 3 pata o te wairewa tohu phenolphthalein, ka titrate ki Ko te uara pH he 6.9-7.1 (i ine ki te mita kawatanga), tuhi te rōrahi V1 (mL) kua pau, ka tāpirihia te 0.5 karamu o te konutai pākawakawa me te 10mL o te waikawa pungatara waimeha, me waiho kia kore rawa e puta te hauhā, tāpirihia te 1.0 karamu o te pāhare pāporo iodide, ka hiritia. pouri mo te 5 meneti, tāpirihia te 1mL o te wairewa tohu māngaro, whakatairitea ki te konutai thiosulfate wairewa titration (0.02mol/L) ki te pito mutunga, tuhia te rōrahi kua pau V2 (mL). I roto i tetahi atu whakamatautau tuwhera, tuhia nga pukapuka Va me Vb (mL) o te wairewa titration konutai hydroxide (0.02mol/L) me te otinga titration konutai thiosulfate (0.02mol/L) ia.
Wā tuku: Apr-25-2024