Nga Puawai Tukua - Apitihanga 1
Te whakarite i te wairewa toenga ethylene oxide
0.1mol/L waikawa pūmāota: waimeha 9ml waikawa pūmāota ki 1000ml.
0.5% te wairewa o te waa: paunatia te 0.5g o te waa me te waimeha ki te 100ml.
Te otinga konutai thiosulfate: paunatia te 1g o te konutai thiosulfate ka waimeha ki te 100ml.
10% te wairewa konutai sulfite: paunatia te 10. 0g konutai sulfite anhydrous, memeha ka waimeha ki te 100ml.
Te otinga whakamatautau waikawa whanariki: paunatia te 0.1g o te fuchsin taketake me te tapiri i te 120ml wai wera hei memeha.Whai muri i te whakamatao, taapirihia te 20ml o te 10% wairewa konutai sulfite me te 2ml o te waikawa pūhaumāota i roto i te pouri.Ko te otinga whakamatautau kia kore he tae.Mena ka kitea he whero, me whakarite ano.
Ethylene glycol otinga kararehe paerewa: tango i te 50ml ipu volumetric maroke me te ma o waho, tāpirihia te 30ml wai, kia tika te pauna, tangohia te 0.5ml ethylene glycol, hohoro te whakauru ki roto i te pounamu, ruru ki runga, paunatia, te rereketanga i waenga i te e rua nga taumahatanga ko te taumaha kei roto i te wairewa, tāpirihia te wai ki te tauine, whakaranuhia, ka tātaihia tōna kukū kia rite ki te tātai e whai ake nei:
C＝W/50 × kotahi mano
C: Glycol kukū otinga kararehe paerewa g/l;
W: Te taumaha o te ethylene glycol i te otinga g
Te wairewa paerewa Ethylene glycol: tango tika i te 1.0ml o te otinga rakau paerewa, ka waimeha ki te 1000ml ki te wai.
Te takahanga o te reagent ngawari:
a.Waimeha waikawa pungatara (20%): Tangohia te H2SO4128ml, ka werohia te 500mL, ka waimeha ki te 1000mL i muri i te whakamatao.
b.Tohu māngaro: tango 0.5 karamu o te māngaro wairewa, whakarewa ki roto i te 100ml wai, whakamahana ka kohuatia, ka whakamatao mo te tatari (me noho hou ina whakamahia mo te wa poto)
c.Te wairewa konupora: tango 3.3gKMnO4, tāpirihia te 1050ml wai, kohuatia mo te 15min, tāpirihia te wai ki te 1050ml, waiho kia tu mo te neke atu i te rua nga ra i muri i te hiritanga, tātarihia ki te kookara karaihe microporous, ruia ake, ka whakatika i tona kukū.
Te whakatikatika: Tangohia te 0.25 karamu o te konutai konutai kua whakamaroke ki te taumaha tonu i te 1050C, ka ata paunatia, ka tapirihia te 100ml o te wairewa waikawa pungatara (8+92) ka whakaoho kia memeha.Kia tere te taapiri i te 25ml o te wairewa paerewa KMnO4 hei whakatikatika ki te otinga mai i te buret.Whai muri i te memenge, whakawerahia ki te 650C ka haere tonu ki te titrate tae noa ki te whero o te wairewa ka noho tonu mo te 30s.I te mutunga o te titration, kaua te pāmahana otinga e iti iho i te 550C, ka whakahaeretia te whakamatautau kore i te wa ano.Ko ia 6.7mg o te konutai oxalate he rite ki te 1ml o te otinga paerewa 0.02mol/L KMnO4.Ko te tino kukū o tenei otinga ka tatauhia i runga i te kai o tenei otinga me te nui o te konutai oxalate i tangohia.
d.C (KMnO4)=0.002 mol/L: Tangohia te 0.02 mol/L KMnO4 ka tapirihia he wai hei waimeha kia 10 nga wa i mua i te whakamahi
e.Konutai thiosulfate (0.1 mol/L): paunatia te 26g Na2S2O3.5H2O ranei 16g anhydrous Na2S2O3, tāpirihia te 0.2g konutai warowaihā anhydrous, memeha ki roto i te 1000ml wai, āta kohuatia mo te 10min, whakamataohia, taapirihia te wai ki te 1000ml. wiki, me te whakatika i tona kukū.
Te whakatikatika: paunatia te 0.18g o te tohutoro pāhare pāporo dichromate kua whakamaroke ki te 1200C ki te taumaha tonu.Kia tika te pauna.Kuhua ki roto i te ipu ine iodine, memeha ki roto ki te 25ml wai, tāpirihia te 2g pāhare pāporo iodide me te 20ml o te waikawa pungatara waimeha (20%), ruru pai, waiho ki te wahi pouri mo te 10min, tāpirihia te 150ml wai, tiritihia. me te otinga Na2S2O3 kua oti te whakarite [c (Na2S2O3) ＝ 0.1 mol/L], tāpirihia te 2ml o te wairewa tohu māngaro (10g/L) ki te pito mutunga, haere tonu te tarai kia huri te otinga mai i te kahurangi ki te kaakaariki kanapa, ka whakahaerehia he whakamatautau paratea i i taua wa ano.Ko ia 1ml o Na2S2O3 (0.1 mol/L) he rite ki te 4.9031mg o te pāhare pāporo dichromate.Ko te kukū o tenei otinga ka tatauhia i runga i te kai o tenei otinga me te nui o te konupora dichromate i tangohia.
f.C (Na2S2O3) ＝ 0.01 mol/L: waimeha 0.1 mol/L Na2S2O3 ki te wai kohua hou ka whakamatao i mua i te tuunga kia 10 nga wa.
Wā tuku: Oketopa-04-2022
