Nzira Yokuziva Nhamba dzeOxidation
Kunzwisisa nhamba dzeoxidation (kana kuti mamiriro eoxidation) ipfungwa yakakosha mukemistri inotibatsira kunzwisisa maitiro emakemikari, kunyanya maitiro e redox. Nhamba yeoxidation inhamba yemaerekitironi anofanira kuwedzerwa kana kubviswa kubva muatomu kuti achinje mamiriro ayo epasi. Muchinyorwa chino, tichaongorora zvakadzama kuti tingaziva sei nhamba yeoxidation yechinhu chiri mumakemikari.
Nheyo dzeOxidation Number
Nhamba dze oxidation dzinogona kufungwa nezvadzo sechishandiso chemasvomhu chinotsanangura kugoverwa kwemaerekitironi mukati memorekuru kana ion. Kunyangwe nhamba dze oxidation dzisingawanzo miriri simba remagetsi remaatomu ari mumorekuru, dzinobatsira kuongorora makemikari.
Mimwe mitemo yekutanga yekuona nhamba dzeoxidation ndeiyi inotevera:
1. Nhamba yekuoxidation yechinhu chiri muchimiro chemorekuru yechinhu (homonuclear) inogara iri zero. Semuenzaniso:
– O₂ (dioxygen) -> Nhamba yayo yekuoxidation i0
– N₂ (dinitrogen) -> Nhamba yayo yekuoxidation i0
2. Nhamba ye oxidation ye monatomic ion yakaenzana nechaji ye ion.
– Na⁺ -> Nhamba yayo yekuoxidation i +1
– Cl⁻ -> Nhamba yayo yekuoxidation i -1
3. Nhamba yehydrogen inosanganiswa neoxidation i +1 kana yakabatana neisiri metal uye -1 kana yakabatana nesimbi muhydride. Semuenzaniso:
– H₂O -> Hydrogen ine nhamba yekuoxidation ye +1
– NaH -> Hydrogen ine nhamba yekuoxidation ye -1
4. Nhamba yekuoxidation yeokisijeni inowanzo kuve -2 mumakomputa mazhinji, asi kune zvimwe zvakasiyana zvakaita semumaperoxide apo nhamba yekuoxidation yeokisijeni iri -1.
– H₂O -> Okisijeni ine nhamba yekuoxidation ye -2
– H₂O₂ (hydrogen peroxide) -> Okisijeni ine nhamba ye oxidation ye -1
5. Huwandu hweoxidation yema halogen (F, Cl, Br, I) mumakomputa hunowanzova -1, kunze kwekunge yakabatana neokisijeni kana mamwe ma halogen uko inogona kusiyana.
Matanho Ekuona Nhamba dzeOxidation
Kuti tizive nhamba ye oxidation yechinhu chiri mukombuta, tinogona kutevera matanho aya:
Danho 1: Nyora Maumbirwo/Foramu yeMolecular yeCompound
Tanga nekunyora chimiro chemorekuru kana fomura yemusanganiswa wacho. Semuenzaniso, yeH₂SO₄ (sulfuric acid).
Danho rechipiri: Sarudza Nhamba yeOxidation yeZvinhu Zvichibva paMitemo
– Kune H₂SO₄, tinoziva kuti hydrogen inenge nguva dzose ine nhamba yekuoxidation ye +1 uye oxygen inenge nguva dzose -2.
– Hydrogen (H): +1 (maatomu maviri eH, +2 ese)
– Okisijeni (O): -2 (maatomu 4 O, -8 ese)
Danho rechitatu: Sarudza Nhamba yeOxidation yeChinhu Chisingazivikanwe
Kana compound yacho ichizove isina kwayakarerekera zvachose kana kuti kana tiri kugadzira maion, tinofanira kuva nechokwadi chekuti huwandu hwese hwenhamba ye oxidation i zero kune macompounds asina kwakarerekera kana kuti yakaenzana ne ionic charge yemaion.
– Sulfuric acid (H₂SO₄) chinhu chisina kusimba. Saka, huwandu hwese hwemamiriro e oxidation hunofanira kunge huri zero.
– Tatova nenhamba dze oxidation dzeH (+1) neO (-2), saka kuti tiwane nhamba ye oxidation yesarufa (S), tinoshandisa equation:
\[
2(+1) + S + 4(-2) = 0
\]
\[
2 + S – 8 = 0
\]
\[
S – 6 = 0
\]
\[
S = +6
\]
Saka, nhamba ye oxidation ye sarufa mu H₂SO₄ ndeye +6.
Danho rechina: Kusimbisa
Simbisa kuti huwandu hwese hwenhamba dzeoxidation hwakaenzana ne0 kune mamorekuru asina kwaakarerekera kana kuti hunoenderana ne ionic charge kana tiri kushanda nemaion.
Mumwe Muenzaniso weKusarudza Nhamba dzeOxidation
Muenzaniso 1: Potassium Permanganate (KMnO₄)
Pamusanganiswa uyu tinotevera mitemo iri pamusoro apa:
– Potassium (K): Kazhinji +1
– Okisijeni (O): -2
Tinoziva kuti molekyuru iyi haina kwayakarerekera, zvichikonzera equation:
\[
1(+1) + Mn + 4(-2) = 0
\]
\[
1 + Mn – 8 = 0
\]
\[
Mn – 7 = 0
\]
\[
Mn = +7
\]
Saka, nhamba ye oxidation yeMn muKMnO₄ ndeye +7.
Muenzaniso wechipiri: Ammonium Nitrate (NH₄NO₃)
Pamusanganiswa uyu tine zvikamu zviviri: NH₄⁺ uye NO₃⁻.
– NH₄⁺:
– Hydrogen (H): +1
– Saka nezve nitrogen (N) muNH₄⁺:
\[
N + 4(+1) = +1
\]
\[
Nhamba + 4 = +1
\]
\[
N = -3
\]
– KWETE₃⁻:
– Okisijeni (O): -2
– Nitrogen (N) muNO₃⁻:
\[
N + 3(-2) = -1
\]
\[
N – 6 = -1
\]
\[
N = +5
\]
Zvimwe Zvisingakoshi uye Zvinhu Zvakakosha
Pane zvimwe zvisiri izvo zvinofanira kurangarirwa nemutemo mukuru:
1. Okisijeni muPeroxide:
– MuH₂O₂ kana Na₂O₂, okisijeni ine nhamba ye oxidation ye -1, kwete -2.
2. Zvinhu zvine Manhamba Akasiyana-siyana eOxidation:
– Zvinhu zvakaita sephosphorus (P), sarufa (S), uye simbi dzinoshanduka zvinowanzova nenhamba dzakasiyana dzeoxidation mumakomponi akasiyana. Semuenzaniso, iron (Fe) inogona kuva nenhamba yeoxidation ye +2 kana +3.
3. Simbi dzemunyika dzine alkaline dzinogara dziri +2 uye simbi dzemunyika dzine alkali dzinogara dziri +1.
Mhedziso
Kuziva nhamba dzeoxidation hunyanzvi hwakakosha uye hwakakosha mukemistri, kunyanya pakunzwisisa maitiro e redox nedzimwe mhando dzakasiyana dzemaitiro emakemikari. Nekutevera mitemo nematanho ari pamusoro, uchakwanisa kuona nhamba dzeoxidation nemazvo mumakemikari akasiyana-siyana. Dzidzira kuona nhamba dzeoxidation nemienzaniso yakasiyana-siyana yemakemikari kuti usimbise kunzwisisa kwako.
