Mibvunzo yemuenzaniso uye Kukurukurirana kweMashandisirwo eElectrochemical
Electrochemistry ibazi rekemesitiri rinoongorora hukama huripo pakati pemakemikari nemagetsi. Muhupenyu hwezuva nezuva, electrochemistry inogona kuwanikwa munzvimbo dzakasiyana-siyana, dzakadai semabhatiri, masensa, ngura, uye maitiro ekugadzira mapurasitiki. Kuti tinzwisise izvi, tinopa mienzaniso yakati wandei yezvinetso nehurukuro dzine chekuita nekushandiswa kwe electrochemistry.
Muenzaniso Mubvunzo 1: Bhatiri reGalvanic (Sero reVoltaic)
Mubvunzo:
Sero regalvanic rinogadzirwa nemaelectrode eZn (zinc) neCu (copper) akanyudzwa muZnSO₄ neCuSO₄ zvakateerana. Simba remaelectrode rakajairika reZn²⁺/Zn i -0,76 V, uye reCu²⁺/Cu i +0,34 V. Verenga voltage yemasero (E° cell) emasero egalvanic.
Kukurukurirana:
1. Sarudza Maitiro eHafu yeSero:
– Kusangana kwehafu yemasero kune zinc (Zn):
\[
Zn \rightarrow Zn^{2+} + 2e^-
\]
– Kusangana kwehafu yemasero emhangura (Cu):
\[
Cu^{2+} + 2e^- \museve wekurudyi Cu
\]
2. Kuziva Anode neCathode:
– Anode (oxidation): Zn → Zn²⁺ + 2e⁻ (yakanyanya kuipa, -0.76 V)
– Cathode (kuderedza): Cu²⁺ + 2e⁻ → Cu (zvimwe zvakanaka, +0.34 V)
3. Kuverenga Voltage Yesero (E° sero):
- Fomura yemagetsi esero yakajairika:
\[
E°_{\text{cell}} = E°_{\text{cathode}} – E°_{\text{anode}}
\]
Ne:
\[
E°_{\text{cathode}} = +0,34 \text{ V}
\]
\[
E°_{\text{anode}} = -0,76 \text{ V}
\]
- Saka, voltage yemasero:
\[
E°_{\text{sel}} = 0.34 \text{V} – (-0.76 \text{V}) = 1.10 \text{V}
\]
Muenzaniso Mubvunzo 2: Electrolysis yeNaCl Solution
Mubvunzo:
Mukugadzirisa electrolysis yeNaCl (aq) solution uchishandisa maerekitironi asina simba, sarudza magasi anogadzirwa paanode necathode. Zvakare, nyora pasi maitiro anoitika paerekitironi yega yega.
Kukurukurirana:
1. Maitiro paElectrode:
– Cathode (Kuderedza):
Maion anogona kunge aripo ndiNa⁺ naH₂O.
Maitiro ekuderedza anowanzoitika ndeaya:
\[
2H_2O + 2e^- \museve wekurudyi H_2 (g) + 2OH^-
\]
Saka, gasi rinogadzirwa pa cathode ndiro \( H_2 \).
– Anode (Kuoxidation):
Maion anogona kunge aripo ndiCl⁻ naH₂O.
Maitiro e oxidation anowanzoitika ndeaya:
\[
2Cl^- \museve wekurudyi Cl_2 (g) + 2e^-
\]
Saka, gasi rinogadzirwa pa anode ndi \(Cl_2 \).
2. Maitiro Ese:
- Mhinduro pa cathode:
\[
2H_2O + 2e^- \museve wekurudyi H_2 (g) + 2OH^-
\]
- Mhinduro pa anode:
\[
2Cl^- \museve wekurudyi Cl_2 (g) + 2e^-
\]
– Kupindura kwese:
\[
2H_2O + 2Cl^- \museve wekurudyi H_2 (g) + Cl_2 (g) + 2OH^-
\]
Muenzaniso Mubvunzo 3: Maitiro ekugadzira Electroplate
Mubvunzo:
Verenga huremu hwesirivha (Ag) hwakaiswa pa cathode nekushandisa magetsi emagetsi e0,5 A kwemaawa maviri muAgNO₃ solution. Huremu hwemolar hwesirivha i107,87 g/mol uye 1 Faraday yakaenzana ne96.485 C/mol e⁻.
Kukurukurirana:
1. Sarudza Mutengo Wese Wemagetsi (Q):
– Nguva Yazvino (I) = 0.5 A
– Nguva (t) = maawa maviri = 2 × 3600 masekondi = 7200 masekondi
– Mutengo wemagetsi wese (Q) unoverengwa uchishandisa fomura:
\[
Q = I \nguva t
\]
- Saka:
\[
Q = 0.5 \chinyorwa{A} \nguva 7200 \chinyorwa{s} = 3600 \chinyorwa{C}
\]
2. Kuverenga Nhamba yeMamore emaElectron (n):
– 1 mole yemaerekitironi = 96.485 C
- Huwandu hwemamorekuru emaerekitironi akaunzwa:
\[
n = \frac{3600 \text{ C}}{96.485 \text{ C/mol}} \approx 0.0373 \text{ mol}
\]
3. Kuziva Huremu hweSirivha Yakaiswa:
- Kuderedza maitiro pa cathode:
\[
Ag^+ + e^- \rightarrow Ag \text{ (s)}
\]
- 1 mole yemaerekitironi inoburitsa 1 mole yeAg
- Huwandu hwemamota eAg akaiswa:
\[
0.0373 \text{ mol Ag}
\]
– Kushandisa molar mass yeAg (107,87 g/mol):
\[
\text{Mass of Ag} = 0.0373 \text{ mol} \times 107.87 \text{ g/mol} \approx 4.02 \text{ g}
\]
Saka, huremu hwesirivha hwakaiswa pa cathode hunosvika 4.02 gramu.
Muenzaniso Mubvunzo 4: Kuora
Mubvunzo:
Tsanangura maitiro ekuora kwesimbi munzvimbo ine hunyoro uye nyora pasi maitiro emakemikari anoitika.
Kukurukurirana:
1. Matanho Engura:
- Mhinduro paAnode:
Simbi inosanganiswa kuita ma ferric ions:
\[
Fe \rightarrow Fe^{2+} + 2e^-
\]
- Mhinduro paCathode:
Okisijeni iri mumhepo inopindirana nemvura nemaerekitironi kubva kuanode:
\[
O_2 + 4H^+ + 4e^- \museve wekurudyi 2H_2O
\]
Munzvimbo isina acidity uye isina divi rayo, mhinduro yacho inogona kunge iri:
\[
O_2 + 2H_2O + 4e^- \museve wekurudyi 4OH^-
\]
2. Kuumbwa kweIron Hydroxide:
– Maion eFe²⁺ anosanganiswa nemaion eOH⁻ kuti aumbe Fe(OH)₂:
\[
Fe^{2+} + 2OH^- \rightarrow Fe(OH)_2
\]
3. Kuumbwa kwengura:
– Kuwedzera kwe oxidation yeFe(OH)₂ kunoburitsa Fe(OH)₃ iyo inooma kuita ngura (Fe₂O₃.nH₂O):
\[
4Fe(OH)_2 + O_2 + 2H_2O \museve wekurudyi 4Fe(OH)_3
\]
– Fe(OH)₃ inogona kuchinja kuita Fe₂O₃ nekurasikirwa nemvura:
\[
2Fe(OH)_3 \kurudyi Fe_2O_3 + 3H_2O
\]
Maitiro aya anoratidza kuti simbi inoora sei kuburikidza nemagetsi akawanda. Ruzivo rwekuora rwakakosha pakuchengetedza kugara kwenguva refu kwezvinhu zvesimbi muzvivakwa nezvivakwa.
Nekunzwisisa mienzaniso yemibvunzo nehurukuro dziri pamusoro apa, zvinotarisirwa kuti vaverengi vanogona kuwana mufananidzo wakajeka wekushandiswa kwemitemo yemagetsi muhupenyu hwezuva nezuva.
