ngā tikanga whakamātautau
Ingoa tikanga: hypromellose—te whakatau i te rōpū hydroxypropoxy—te whakatau i te rōpū hydroxypropoxy
Whānuitanga o te whakamahinga: Ka whakamahia e tēnei tikanga te tikanga whakatau hydroxypropoxy hei whakatau i te nui o te hydroxypropoxy i roto i te hypromellose. E tika ana tēnei tikanga mō te hypromellose.
Te mātāpono o te tikanga:Tātaihia tete ihirangi o te hydroxypropoxy i roto i te hua whakamātautau e ai ki te tikanga whakatau hydroxypropoxy.
Kaiwhakaora:
1. 30% (g/g) te otinga chromium trioxide
2. Hauwaiora
3. Wairewa tohu Phenolphthalein
4. Paikāponate konutai
5. Whakarewahia te waikawa whanariki
6. Pāhare pākawa iodide
7. Otinga titration konutai thiosulfate (0.02mol/L)
8. Wairewa tohu māngaro
taputapu:
Te whakarite tauira:
1. Otinga titration konutai hauwai (0.02mol/L)
Te Whakarite: Tangohia he 5.6mL o te otinga konutai hauwai mārama, tāpirihia he wai matao kua kohuatia kia 1000mL te rahi.
Whakatikatika: Tangohia kia 6 karamu o te pāhare pākawa waro pāhare pākawa paerewa kua whakamaroketia i te 105°C kia pumau te taumaha, paunatia kia tika, tāpirihia he 50mL o te wai matao kua kohuatia, rūrūtia kia memeha rawa; tāpirihia kia 2 pata o te otinga tohu phenolphthalein, whakamahia tēnei titration Wai, ina tata ki te pito mutunga, me memeha rawa te pāhare pākawa waro pākawa, ā, titration kia māwhero te otinga. Ko ia 1mL o te otinga titration konutai hauwai (1mol/L) he rite ki te 20.42mg o te pāhare pākawa waro pākawa. Tātaihia te kukū o tēnei otinga i runga i te kai o tēnei otinga me te nui o te pāhare pākawa waro pākawa i tangohia. Whakaranua kia 5 ngā wā kia 0.02mol/L te kukū.
Rokiroki: Whakanohoia ki roto i tētahi pounamu kirihou polyethylene, ā, puritia kia hiritia; e rua ngā kōhao i roto i te mono, ā, ka whakauruhia kia kotahi te ngongo karāhe ki ia kōhao, ka honoa kia kotahi te ngongo ki tētahi ngongo houra raima, ā, ka whakamahia kia kotahi te ngongo hei ngongo i te wai.
2. Wairewa tohu phenolphthalein Tangohia te 1 karamu o te phenolphthalein, tāpirihia te 100mL o te etanoru hei whakarewa
3. Te Whakatakotoranga o te Wai Tiosulfate Konutai (0.02mol/L): Tangohia te 26 karamu o te Tiosulfate Konutai me te 0.20 karamu o te Konutai Kāponāte Korewai, tāpirihia he nui o te wai matao kua kohuatia hou hei whakarewa ki roto i te 1000mL, rūrūtia kia pai, ka waiho mō te tātari mō te 1 marama. Te Whakatikatika: tangohia te 0.15 karamu o te pāhare pākawa dichromate paerewa kua whakamaroketia i te 120°C me te taumaha pumau, paunatia kia tika, maka ki roto i te pounamu iodine, tāpirihia te 50mL o te wai hei whakarewa, tāpirihia te 2.0 karamu o te Pāhare Pākawa Iodide, rūrūtia mārire kia rewa, tāpirihia te 40mL o te Waikawa Whanariki Wairewa, Rūrūtia kia pai, ka hiritia kia mau; i muri i te 10 meneti ki te wāhi pōuri, tāpirihia te 250mL o te wai hei whakarewa, ā, ina oti te tito te wai kia tata ki te pito mutunga, tāpirihia te 3 mL o te Wai Tohu Māngaro, haere tonu te tito kia ngaro ra ano te tae kikorangi, kia kakariki kanapa, ā, ka whakamahia te hua tito hei whakatikatika Whakamātautau kau. Ko ia 1mL o te konutai thiosulfate (0.1mol/L) he rite ki te 4.903g o te pāhare pākawa dichromate. Tātaihia te kukū o te otinga i runga i te whakamahinga o te otinga me te nui o te pāhare pākawa dichromate i tangohia. Whakaranua kia 5 ngā wā kia eke te kukū ki te 0.02mol/L. Mena kei runga ake i te 25°C te pāmahana o te rūma, me whakamatao te pāmahana o te otinga tauhohenga me te wai whakaranua ki te 20°C pea.
4. Wairewa tohu māngaro Tangohia te 0.5 karamu o te māngaro wairewa, tāpirihia te 5mL o te wai, ka whakaohokia kia pai, kātahi ka ringihia mārire ki roto i te 100mL o te wai kohua, ka whakaohokia i a ia e tāpiri ana, me kohuatia tonu mō te 2 meneti, waiho kia whakamatao, ka ringihia te wai i waho, ā, kua rite.
Me whakarite hou tēnei otinga i mua i te whakamahinga.
Ngā mahi whakahaere: Tangohia te 0.1 karamu o tēnei hua, paunatia kia tika, maka ki roto i te pounamu whakahoro D, tāpirihia he 10mL o te 30% (g/g) o te otinga cadmium trichloride. Whakakīia te ngongo whakaputa mamaoa B ki te wai ki te hononga, ka hono i te wae whakahoro. Rukuhia a B me D ki roto i te kaukau hinu (ka taea te glycerin), kia rite te taumata wai o te kaukau hinu ki te taumata wai o te otinga cadmium trichloride i roto i te pounamu D, tahurihia te wai whakamatao, ā, ki te tika, tukua te rerenga hauota ki roto, ka whakahaere i tōna tere rere ki te 1 mirumiru ia hekona. I roto i ngā meneti 30, whakapiki ake i te pāmahana o te kaukau hinu ki te 155ºC, ā, kia mau tonu tēnei pāmahana kia kohia rā anō te 50 mL o te wai whakatārewatanga. Tangohia te ngongo whakapūmau mai i te pou whakawehenga, horoia ki te wai, horoia, ka whakauru ki roto i te wai kua kohia, tāpirihia kia 3 ngā pata o te wai tohu phenolphthalein, ka whakatio kia 6.9-7.1 te uara pH (inehia ki te mita waikawa), tuhia te rōrahi i pau V1 (mL), kātahi ka tāpirihia te 0.5 karamu o te konutai paikāpōnate me te 10 mL o te waikawa whanariki waimeha, waiho kia tū kia kore rawa he hauhā waro e puta, tāpirihia te 1.0 karamu o te pāhare pākawa iodide, ka hiritia. Rūrūtia kia pai, waiho ki te pōuri mō te 5 meneti, tāpirihia te 1 mL o te wai tohu māngaro, whakatio ki te wai tohu konutai thiosulfate (0.02mol/L) ki te pūwāhi mutunga, tuhia te rōrahi i pau V2 (mL). I tētahi atu whakamātautau pātea, tuhia ngā rōrahi Va me Vb (mL) o te otinga titration konutai hauwai (0.02mol/L) me te otinga titration konutai thiosulfate (0.02mol/L) i pau.
Wā tuku: Paenga-whāwhā-25-2024