He aha te Titration Waikawa-Base?
Ko te titration waikawa-pūtake he tikanga tātari matū e whakamahia ana i roto i ngā taiwhanga hei whakatau i te kukū o tētahi otinga waikawa, turanga rānei. He māmā noa iho tēnei tikanga, engari he tino hira i roto i te mahi, inā koa i roto i te mātauranga, te ahumahi, ngā rongoā, te kai, me te taiao. Mā te titration ka taea e tātou te whakatau i te kukū o tētahi matū i roto i tētahi otinga me te kore e paunatia tika, engari mā roto i tētahi tauhohenga whakahāngai ine.
Te Mārama ki te Whakapūtanga Waikawa-Pūtake
I te nuinga o te wā, ko te titration he tikanga tātari rōrahi , arā, he tātari e whakawhirinaki ana ki te ine rōrahi. I roto i te titration waikawa-pūtake , ko te tauhohenga e puta ana ko te tauhohenga whakakore: ka tauhohe te waikawa ki te pūtake hei whakaputa tote me te wai. I roto i tētahi whakamātautau, ko te otinga e mōhiotia ana te kukū ka kiia ko te titrant (e whakanohoia ana ki roto i te burette), ko te otinga e whakatauhia ana te kukū ka kiia ko te analyte (e whakanohoia ana ki roto i te pounamu Erlenmeyer).
Ko te whāinga matua o te ine i te waikawa-pūtake ko te kimi i te pūwāhi ōrite, arā, ko te pūwāhi e ōrite ana te maha o ngā mole o te waikawa e tauhohe ana ki te maha o ngā mole o te pūtake e tauhohe ana. Nā te mea kāore e kitea wawetia te pūwāhi ōrite, ka whakamahia he tohu, he taputapu ine rānei pērā i te mita pH hei kite i te wā kua tae te tauhohenga ki tēnei pūwāhi.
Ngā Mātāpono Taketake o ngā Tauhohenga Whakakore
Ka taea te whakaahua i te tauhohenga whakahāngai māmā penei:
– Waikawa + Kawenga → Tote + Wai
Tauira o te tauhohenga i waenga i te waikawa hauwai me te hauwai konutai:
– HCl(aq) + NaOH(aq) → NaCl(aq) + H₂O(l)
I te pūwāhi ōrite o te titration, ka ōrite te maha o ngā mole o te HCl ki te maha o ngā mole o te NaOH. Nā te kaha o ngā mea e rua, he tino koi te huringa pH huri noa i te pūwāhi ōrite, ā, he māmā noa iho te kite mā te whakamahi i tētahi tohu e tika ana.
He hononga tata te ariā o ngā tātaitanga titration ki te molarity me te stoichiometry. I te nuinga o te wā, ko ngā whanaungatanga e whakamahia ana ko:
– (M₁ × V₁) / tauwehenga = (M₂ × V₂) / tauwehenga
Ko M te molarity, ko V te rōrahi, ā, ko ngā tauwehenga ko ngā tauwehenga tauhohenga e ai ki te whārite matū (ki te kore e 1:1).
Ngā Utauta me ngā Rauemi i Whakamahia
He maha ngā taputapu paerewa e hiahiatia ana mō te titration waikawa-pūtake, tae atu ki:
1. Pūrere: He taputapu hei maturuturu mārire i te wai, hei ine tika hoki i te rōrahi.
2. Erlenmeyer: He ipu mō te tātari e titration ana kia ngāwari te rūrū, kia kore ai hoki e maringi wawe.
3. Paipa rahinga: Hei tango tika i tētahi rahinga o te analyte.
4. Tū me te whakapiri: Hei pupuri i te pūrere kia tika, kia mau hoki.
5. Ngā tohu waikawa-pūtake: Ngā matū e huri ana te tae i tētahi awhe pH.
6. Otinga paerewa: Otinga titrant me te kukū e mōhiotia ana (hei tauira, te NaOH paerewa, te HCl paerewa rānei).
I roto i te mahi, he nui te pānga o te tika o te pūrere me te pipette ki ngā hua, nō reira me whakamahi tika, ā, me tika hoki te pānui o te meniscus.
Ngā Tohu me ngā Huringa Tae
He wāhanga nui ngā tohu o te ine i te waikawa-pūtake. He matū waro ngoikore ngā tohu e whakaatu ana i ngā tae rerekē i roto i ō rātou āhua waikawa me te āhua taketake. Ko te kōwhiringa tohu e whakawhirinaki ana ki te momo waikawa me te pūtake e inehia ana, nā te mea me tata te pito mutunga o te ine i te pūwāhi ōrite.
Ngā tauira o ngā tohu e whakamahia whānuitia ana:
– Phenolphthalein (PP): Kore tae i roto i ngā āhuatanga waikawa, ka huri hei māwhero i roto i ngā āhuatanga kawakore (te awhe pH tata ki te 8,2–10).
– Karaka metila (MO): Whero i ngā āhuatanga waikawa, kōwhai i ngā āhuatanga kawakore (pH kei waenganui i te 3,1–4,4).
– Kahurangi Bromthymol (BTB): Kōwhai (waikawa), kakariki (kūpapa), kahurangi (taketake) me te awhe pH tata ki te 6,0–7,6.
I roto i ngā inenga waikawa kaha–pūtake kaha, he maha ngā tohu ka taea te whakamahi nā te mea he tino koi te pikinga pH i te pūwāhi ōrite. Heoi, i roto i ngā inenga waikawa ngoikore–pūtake kaha, waikawa kaha–pūtake ngoikore rānei, me tino tupato te whiriwhiri tohu.
Pūwāhi Taurite me te Pūwāhi Mutunga
I roto i te titration, he mea nui kia wehewehea ngā kupu e rua:
– Te pūwāhi ōrite: Ko te āhua ariā ina ōrite tonu ngā ira o te waikawa me ngā ira o te turanga ki te stoichiometry o te tauhohenga.
– Te pūwāhi mutunga: He āhuatanga mahi e tohuhia ana e te panoni o te tae o tētahi tohu, e tētahi pānui pH rānei.
Me tata rawa te pūwāhi mutunga ki te pūwāhi ōrite. Ko te rerekētanga i waenganui i ngā mea e rua ka kiia ko te hapa tohu, ka pā pea tēnei ki te tika o ngā hua ine ine.
Ngā Momo Titration Waikawa-Base
Ka taea te wehewehe i ngā inenga waikawa-pūtake i runga i te kaha o te waikawa me te pūtake e tauhohe ana:
1. Waikawa kaha – kakano kaha
Tauira: Ka titrated te HCl ki te NaOH. Ko te pūwāhi ōrite kei te pH tata ki te 7.
2. Waikawa ngoikore – turanga pakari
Tauira: Ka whakatōpūtia te CH₃COOH (waikawa acetic) ki te NaOH. I te pūwāhi ōrite, ka nui ake te pH i te 7 nā te mea ka hangaia he tote taketake (hei tauira, te konutai acetate). He maha ngā wā ka pai ngā tohu pēnei i te phenolphthalein.
3. Waikawa kaha – kakano ngoikore
Tauira: Ka titrated te HCl ki te NH₄OH. Ko te pH i te pūwāhi ōrite he iti iho i te 7 nā te mea he waikawa te tote i hangaia.
4. Waikawa ngoikore – te kakano ngoikore
Tauira: waikawa acetic me te haukini. Kāore i te tino kitea te huringa pH huri noa i te pūwāhi ōrite, nō reira kāore i te tino whai hua te tohu; he pai ake te whakamahi i te mita pH.
Ngā Hipanga Whānui o te Titration
Ko te tikanga whānui, ko te tukanga titration waikawa-pūtake:
1. Horoia te pūrere ki te wai whakapūkara hei ārai i te memeha haere nā te wai.
2. Whakakīia te pūrere, kia kore ai he mirumiru hau i te pito o te taputapu.
3. Tangohia te rōrahi o te tātaritanga mā te whakamahi i tētahi pipette rōrahi, kātahi ka maka ki roto i te pounamu Erlenmeyer.
4. Tāpirihia ētahi pata o te tohu ki te tātaritanga.
5. Tukua te titrant mai i te burette me te whakaoho mārire i te pounamu Erlenmeyer.
6. I a koe e whakatata atu ana ki te pito whakamutunga, kia āta maturuturu kia kore ai e ngaro te panoni tae.
7. Tuhia te rōrahi o te titrant i whakamahia ina tae ki te pūwāhi mutunga.
8. Whakahoutia te ine ine kia puta rā anō ngā hua ōrite (e toru ngā ine ine me ngā rerekētanga iti).
Ngā Tauira o te Whakamahinga i roto i te Ao me te Ahumahi
He maha ngā whakamahinga o te titration waikawa-pūtake i te ao tūturu, hei tauira:
– Whakatauhia te taumata o te waikawa acetic i roto i te winika.
– Te whakamātautau i ngā taumata kawakore i roto i ngā hua horoi, i te hopi rānei.
– Te ine i te kawakore o te wai i roto i te tātaritanga taiao.
– Te whakahaere kounga i roto i te hanga rongoā me ngā matū.
– Whakatauhia te kukū o ngā otinga paerewa i roto i te taiwhanga.
Nā te mea he iti te utu o tēnei tikanga, he tika hoki, kua noho te ine ine hei tikanga noa mō te whakahaere kounga i roto i te maha o ngā ahumahi.
Whakamutunga
Ko te titration waikawa-pūtake he tikanga tātari rōrahi e whakamahia ana hei whakatau i te kukū o tētahi otinga waikawa, pūtake rānei mā te tauhohenga whakahāngai. Ko te kaupapa o te titration ko te tae ki te pūwāhi ōrite me te kimi mā te whakamahi i tētahi tohu, i tētahi mita pH rānei. Ko te angitu o te titration he mea nui ki te ine tika i te rōrahi, te whiriwhiri i te tohu tika, me te mārama ki ngā āhuatanga o ngā waikawa me ngā pūtake e whakamahia ana. Mā te mārama ki te ariā o te titration waikawa-pūtake, ka taea e tātou te whakamahi pai i tēnei tikanga mō ngā kaupapa mātauranga me ngā kaupapa ahumahi, tae atu ki ngā tātari o ia rā.
Ki te hiahia koe, ka taea hoki e au te tāpiri i ngā tauira o ngā rapanga tatau ira-waikawa-pūtake me ā rātou matapakinga, ka taea rānei e au te waihanga i tētahi putanga māmā ake o te tuhinga mō ngā ākonga kura tuarua.
