Indlela Yokuthola Izinombolo Zokuxiliswa Kwe-Oxidation
Ukuqonda izinombolo ze-oxidation (noma izimo ze-oxidation) umqondo obalulekile kumakhemikhali osisiza siqonde ukusabela kwamakhemikhali, ikakhulukazi ukusabela kwe-redox. Inombolo ye-oxidation yinani lama-electron okumele engezwe noma asuswe ku-athomu ukuze alishintshele esimweni salo somhlabathi. Kulesi sihloko, sizohlola ngokujulile ukuthi singanquma kanjani inombolo ye-oxidation yento ethile ekwakhiweni kwamakhemikhali.
Izisekelo Zenombolo Yokuxutshwa Kwe-Oxidation
Izinombolo ze-oxidation zingacatshangwa njengethuluzi lezibalo elisemthethweni elichaza ukusatshalaliswa kwama-electron ngaphakathi kwe-molecule noma i-ion. Nakuba izinombolo ze-oxidation zingameleli njalo ukushaja kagesi kwangempela kwama-athomu ku-molecule, zenza kube lula ukuhlaziywa kwamakhemikhali.
Eminye imithetho eyisisekelo yokunquma izinombolo ze-oxidation yilena elandelayo:
1. Inombolo ye-oxidation yento ngesimo se-molecule yento (i-homonuclear) ihlala ingu-zero. Isibonelo:
– O₂ (i-dioxygen) -> Inombolo yayo ye-oxidation ingu-0
– N₂ (dinitrogen) -> Inombolo yayo ye-oxidation ingu-0
2. Inombolo ye-oxidation ye-ion ye-monatomic ilingana nokushaja kwe-ion.
– Na⁺ -> Inombolo yayo yokuxiliswa yi-+1
– Cl⁻ -> Inombolo yayo ye-oxidation ingu--1
3. Inombolo ye-oxidation ye-hydrogen ingu-+1 uma ihlanganiswa ne-non-metal kanye no--1 uma ihlanganiswa nensimbi ku-hydride. Isibonelo:
– H₂O -> I-hydrogen inenombolo ye-oxidation engu-+1
– NaH -> I-hydrogen inenombolo ye-oxidation engu--1
4. Inombolo ye-oxidation ye-oxygen ngokuvamile ingu-2 kuma-compound amaningi, kodwa kunezimo ezihlukile njengakuma-peroxide lapho inombolo ye-oxidation ye-oxygen ingu-1.
– H₂O -> I-oxygen inenombolo ye-oxidation engu--2
– H₂O₂ (i-hydrogen peroxide) -> I-oxygen inenombolo ye-oxidation engu--1
5. Inani le-oxidation lama-halogen (F, Cl, Br, I) kuma-compounds ngokuvamile liyi--1, ngaphandle kokuhlanganiswa nomoya-mpilo noma amanye ama-halogen lapho lingahluka khona.
Izinyathelo Zokunquma Izinombolo Zokuxutshwa Kwe-Oxidation
Ukuze sithole inombolo ye-oxidation yento ekwakhiweni, singalandela lezi zinyathelo:
Isinyathelo 1: Bhala Isakhiwo/Ifomula Yamamolekyuli Ye-Compound
Qala ngokubhala isakhiwo sama-molecule noma ifomula ye-compound. Isibonelo, nge-H₂SO₄ (i-sulfuric acid).
Isinyathelo sesi-2: Thola Inani Le-Oxidation Lezinto Ngokusekelwe Emithethweni
– Ku-H₂SO₄, siyazi ukuthi i-hydrogen cishe njalo inenombolo ye-oxidation engu-+1 kanti i-oxygen cishe njalo -2.
– I-Hydrogen (H): +1 (ama-athomu angu-2 H, +2 esewonke)
– I-oksijini (O): -2 (ama-athomu angu-4 O, -8 esewonke)
Isinyathelo 3: Thola Inombolo Yokuxiliswa Kwe-Elementi Engaziwa
Uma i-compound izoba neutral ngokuphelele noma uma senza ama-ion, kumelwe siqinisekise ukuthi inani eliphelele lenombolo ye-oxidation liyi-zero kuma-compound angathathi hlangothi noma lilingana ne-ionic charge yama-ion.
– I-asidi ye-sulfuric (H₂SO₄) iyinhlanganisela engathathi hlangothi. Ngakho-ke, inani eliphelele lezimo ze-oxidation kumele libe yi-zero.
– Sesinazo kakade izinombolo ze-oxidation ze-H (+1) kanye ne-O (-2), ngakho-ke ukuthola inombolo ye-oxidation yesulfure (S), sisebenzisa i-equation:
\[
2(+1) + S + 4(-2) = 0
\]
\[
2 + S – 8 = 0
\]
\[
S – 6 = 0
\]
\[
S = +6
\]
Ngakho-ke, inombolo ye-oxidation yesulfure ku-H₂SO₄ ingu-+6.
Isinyathelo 4: Ukuqinisekiswa
Qinisekisa ukuthi inani eliphelele lezinombolo ze-oxidation lilingana no-0 kuma-molecule angathathi hlangothi noma lihambisana neshaja ye-ionic uma sisebenza nama-ion.
Esinye Isibonelo Sokunquma Izinombolo Zokuxutshwa Kwe-Oxidation
Isibonelo 1: I-Potassium Permanganate (KMnO₄)
Kule nhlanganisela silandela imithetho engenhla:
– I-Potassium (K): Ngokuvamile +1
– I-oksijini (O): -2
Siyazi ukuthi le molekyuli ayithathi hlangothi, okuholela kulesi sibalo:
\[
1(+1) + Mn + 4(-2) = 0
\]
\[
1 + Mn – 8 = 0
\]
\[
Mn – 7 = 0
\]
\[
Mn = +7
\]
Ngakho-ke, inombolo ye-oxidation ye-Mn ku-KMnO₄ ingu-+7.
Isibonelo 2: I-Ammonium Nitrate (NH₄NO₃)
Kule nhlanganisela sinezingxenye ezimbili: i-NH₄⁺ kanye ne-NO₃⁻.
– NH₄⁺:
– I-hydrogen (H): +1
– Ngakho-ke nge-nitrogen (N) ku-NH₄⁺:
\[
N + 4(+1) = +1
\]
\[
N + 4 = +1
\]
\[
N = -3
\]
– CHA₃⁻:
– I-oksijini (O): -2
– I-nitrogen (N) ku-NO₃⁻:
\[
N + 3(-2) = -1
\]
\[
N – 6 = -1
\]
\[
N = +5
\]
Ezinye Izinto Ezihlukile Nezindaba Ezikhethekile
Kukhona okunye okuhlukile emthethweni ojwayelekile okufanele ukukhumbule:
1. I-oksijini ku-Peroxide:
– Ku-H₂O₂ noma ku-Na₂O₂, i-oxygen inenombolo ye-oxidation engu--1, hhayi u--2.
2. Izinto ezinezinombolo eziningi ze-Oxidation:
– Izinto ezifana ne-phosphorus (P), i-sulfur (S), kanye ne-transition metals zivame ukuba nezinombolo ze-oxidation ezahlukene kuma-compounds ahlukene. Isibonelo, i-iron (Fe) ingaba nenombolo ye-oxidation engu-+2 noma +3.
3. Izinsimbi Zomhlaba Ezine-Alkaline zihlala ziyi-+2 kanti izinsimbi ze-Alkali zihlala ziyi-+1.
Isiphetho
Ukunquma izinombolo ze-oxidation kuyikhono eliyisisekelo nelibalulekile kumakhemikhali, ikakhulukazi ekuqondeni ukusabela kwe-redox kanye nezinye izinhlobo ezahlukene zokusabela kwamakhemikhali. Ngokulandela imithetho nezinyathelo ezingenhla, uzokwazi ukunquma ngokunembile izinombolo ze-oxidation ezinhlobonhlobo zamakhemikhali. Zijwayeze ukuthola izinombolo ze-oxidation ngezibonelo ezahlukahlukene zamakhemikhali ukuze uqinise ukuqonda kwakho.
