Mienzaniso yeMibvunzo Inotaura nezveMasero eVoltaic
Pendauluan
Sero revoltaic, rinozivikanwawo se galvanic cell, mudziyo unoshandura simba remakemikari kuita simba remagetsi kuburikidza ne redox (oxidation-reduction) reaction. Sero revoltaic rine ma electrodes maviri, anowanzo gadzirwa nesimbi dzakasiyana, akanyudzwa mu electrolyte uye akabatanidzwa ne salt bridge. Muchinyorwa chino, tichakurukura mienzaniso yakati wandei ine chekuita nemasero evoltaic kuti tinzwisise mashandiro awo uye maitiro ekuverenga kugona kwemasero.
Dzidziso Yekutanga yeMasero eVoltaic
Usati waenderera mberi kumatambudziko emuenzaniso, zvakakosha kunzwisisa pfungwa huru uye zvikamu zvinoumba sero reVoltaic:
1. Anode neCathode: Musero reVoltaic, anode ndiyo electrode apo oxidation inoitika, uye cathode ndiyo electrode apo kudzikiswa kunoitika. Anode ine negative charge, nepo cathode ine positive charge.
2. Nzira yeElectron: Maerekitironi anoyerera kubva muanode kuenda ku cathode kuburikidza nedunhu rekunze, zvichigadzira magetsi.
3. Kugona Kwemasero (E°cell): Kugona Kwemasero mutsauko uripo pakati pemaelectrode maviri. Kugona Kwemasero kwakajairika (E°cell) kunogona kuverengerwa uchishandisa fomura:
\[
E°sero = E°cathode – E°anode
\]
apo \(E°cathode\) uye \(E°anode\) ndiwo ma "standard reduction potentials" e cathode ne anode.
4. Zambuko reMunyu: Zambuko iri rinoenzanisa maion charges mumhinduro dzese dze electrolyte nekubvumira kufamba kwemaion.
Mibvunzo yemuenzaniso nekukurukurirana
Kuti tijekese pfungwa idzi, ngatikurukurei mimwe mienzaniso yezvinetso.
Muenzaniso Mubvunzo 1
Mubvunzo:
Verengai potential yemasero akajairwa eVolta cell ine maelectrode eZn | Zn²⁺ (aq) uye maelectrode eCu | Cu²⁺ (aq). Zvinozivikanwa kuti potential yekuderedza yakajairwa \(E°\) yeZn²⁺ | Zn i -0.76 V uye \(E°\) yeCu²⁺ | Cu i +0.34 V.
Kukurukurirana:
Danho rekutanga nderekuona kuti anode ne cathode ndezvipi.
Zn ine mukana wekuderedza negative (-0.76 V) kupfuura Cu (+0.34 V), saka Zn inoshanda seanode (nzvimbo ye oxidation) uye Cu se cathode (nzvimbo yekuderedza).
Tevere, tinoshandisa fomura:
\[
E°sero = E°cathode – E°anode
\]
Tsiva tsika dzinozivikanwa:
\[
Sero reE = 0.34 V – (-0.76 V)
\]
\[
Sero reE° = 0.34 V + 0.76 V
\]
\[
Sero reE° = 1.10 V
\]
Saka, simba remaseru rinowanzo shandiswa i1.10 V.
Muenzaniso Mubvunzo 2
Mubvunzo:
Sero reVoltaic rinogadzirwa nemaelectrode eFe | Fe²⁺ uye maelectrode eAg | Ag⁺. Kugona kudzikiswa kweFe²⁺ | Fe i -0.44 V uye yeAg⁺ | Ag i +0.80 V. Verenga kugona kwesero kwakajairika uye nyora maitiro esero.
Kukurukurirana:
Sezvatakamboita, tinofanira kuziva kuti anode ne cathode zvinorevei. Sezvo mukana wekudzikisa Fe²⁺/Fe uri pasi peAg⁺/Ag, Fe inoshanda seanode uye Ag se cathode.
Shandisa fomura iyi:
\[
E°sero = E°cathode – E°anode
\]
\[
Sero reE = 0.80 V – (-0.44 V)
\]
\[
Sero reE° = 0.80 V + 0.44 V
\]
\[
Sero reE° = 1.24 V
\]
Simba remaseru rinowanzo shandiswa i1.24 V.
Kuti tiwane mhinduro yesero, tinobatanidza maitiro ekuoxidation nekuderedza:
– Kuita pa anode: \( \text{Fe} \rightarrow \text{Fe}^{2+} + 2\text{e}^- \)
– Maitiro pa cathode: \( \text{Ag}^+ + \text{e}^- \rightarrow \text{Ag} \)
Kuenzanisa huwandu hwemaerekitironi mukuita kwese:
\[
\text{Fe} \rightarrow \text{Fe}^{2+} + 2\text{e}^-
\]
\[
2\text{Ag}^+ + 2\text{e}^- \rightarrow 2\text{Ag}
\]
Maitiro ese emasero:
\[
\text{Fe} + 2\text{Ag}^+ \rightarrow \text{Fe}^{2+} + 2\text{Ag}
\]
Muenzaniso Mubvunzo 3
Mubvunzo:
Verengai mukana wemasero pa25°C kune sero reVoltaic rine maelectrode eAl | Al³⁺ uye maelectrode eNi | Ni²⁺, kana huwandu hweAl³⁺ huri 0.001 M uye huwandu hweNi²⁺ huri 1 M. Zvinozivikanwa kuti \(E°\) yeAl³⁺ | Al iri -1.66 V uye \(E°\) yeNi²⁺ | Ni iri -0.23 V.
Kukurukurirana:
Kutanga, sarudza anode ne cathode:
– Kugona kuderedza Al³⁺/Al kwakanyanya kuipa (-1.66 V) kupfuura Ni²⁺/Ni (-0.23 V), saka Al ndiyo anode uye Ni ndiyo cathode.
Simba remasero rakajairwa rinoverengerwa seizvi:
\[
E°sero = E°cathode – E°anode
\]
\[
Sero reE = -0.23 V – (-1.66 V)
\]
\[
Sero reE° = -0.23 V + 1.66 V
\]
\[
Sero reE° = 1.43 V
\]
Tevere, tinoshandisa Nernst Equation kuverenga kugona kwesero pasi pemamiriro asina kujairika:
\[
E_{cell} = E°cell – \left( \frac{RT}{nF} \right) \ln Q
\]
Apo \( Q = \frac{[\text{Al}³⁺]}{[\text{Ni}²⁺]} \), R ndiyo gasi risingaperi (8.314 J/mol·K), T ndiyo tembiricha iri muKelvin (298 K pa25°C), F ndiyo Faraday risingaperi (96485 C/mol), uye n ndiyo nhamba yemaerekitironi (6 yemaitiro anosanganisira Al³⁺ naNi²⁺).
Tsiva tsika dzinozivikanwa mu equation:
\[
Q = \frac{0.001}{1} = 0.001
\]
\[
E_{cell} = 1.43 V – \left( \frac{8.314 \times 298}{6 \times 96485} \right) \ln 0.001
\]
\[
E_{cell} = 1.43 V – \left( \frac{2477.172}{578910} \right) \ln 0.001
\]
\[
E_{cell} = 1.43 V – (0.00428) \ln 0.001
\]
\[
\l 0.001 = -6.907
\]
\[
E_{cell} = 1.43 V – (0.00428 \nguva -6.907)
\]
\[
E_{cell} = 1.43 V + 0.0295
\]
\[
E_{cell} = 1.4595 V
\]
Saka, kugona kwemasero panguva iyi kuri pamusoro pe1.46 V.
Mhedziso
Sero revoltaic ipfungwa huru mu electrochemistry inoshandura simba remakemikari kuita simba remagetsi. Chinyorwa chino chakaunza hwaro hwedzidziso yeVoltaic cell uye chakapa mienzaniso yekubatsira kujekesa maitiro ekuverenga kugona kwemasero. Nekunzwisisa uku, vaverengi vanotarisira kuti vachanzwisisa zviri nani masero eVoltaic uye mashandisirwo awo mumamiriro akasiyana-siyana.
