Qhov sib txawv tseem ceeb ntawm galvanic cell thiab concentration cell yog tias galvanic cell yuav los yog tsis muaj ob ib nrab ntawm cov hlwb nrog tib cov muaj pes tsawg leeg whereas ib tug concentration cell muaj ob ib nrab hlwb nrog tib lub cev.
Ob lub galvanic cell thiab cov cell concentration yog cov hlwb electrochemical. Lub xovtooj ntawm electrochemical yog ib yam khoom siv uas tuaj yeem tsim hluav taws xob siv cov tshuaj tiv thaiv lossis ua kom muaj tshuaj lom neeg tshwm sim siv hluav taws xob.
Dab tsi yog Galvanic Cell?
Ib galvanic cell yog ib hom electrochemical cell uas siv cov tshuaj tiv thaiv redox los tsim hluav taws xob. Lub ntsiab lus ntawm lub cell no yog voltaic cell. Lub xovtooj ntawm tes muaj ob lub hlwb ib nrab uas tuaj yeem ua tau zoo ib yam los yog sib txawv. Txhua ib nrab ntawm tes muaj ib qho electrode thiab ib qho electrolyte. Cov electrode yuav tsum tau muab tso rau hauv cov tshuaj electrolytic. Qee lub sij hawm cov electrolytes no sib cais tag nrho, tab sis lwm lub sij hawm lawv tsuas yog sib cais los ntawm ib qho porous barrier. Thaum cov electrolytes tau sib cais tag nrho, peb yuav tsum siv tus choj ntsev kom muaj kev txav ntawm ions ntawm ob lub electrolytes.
Daim duab 01: Yooj Yim Galvanic Cell
Hauv kev npaj lub xovtooj no, peb yuav tsum xav txog seb cov electrodes thiab electrolytes puas yog tus kheej lossis tsis yog. Peb tuaj yeem pom nws theoretically los ntawm kev suav cov electrode muaj peev xwm ntawm txhua ib nrab ntawm tes. Txawm li cas los xij, ib nrab ntawm tes yuav tsum tau qhia oxidation, thaum lwm ib nrab ntawm tes yuav tsum qhia qhov txo qis. Oxidation tshwm sim ntawm anode, qhov txo qis tshwm sim ntawm cathode. Txij li thaum lub galvanic (voltaic) cell siv lub zog tso tawm thaum lub sij hawm ib tug spontaneous redox cov tshuaj tiv thaiv los tsim hluav taws xob, galvanic hlwb yog ib qho tseem ceeb raws li ib tug qhov chaw ntawm hluav taws xob zog. Lawv tsim direct tam sim no.
Lub Cev Cuam Tshuam yog dab tsi?
Kev sib xyaw ntawm tes yog ib hom galvanic cell uas ob ib nrab ntawm cov cell zoo sib xws hauv cov khoom sib xws. Yog li ntawd, peb hais ob ib nrab hlwb sib npaug. Lawv tsuas yog txawv ntawm qhov concentration. Qhov hluav taws xob tsim los ntawm lub xovtooj ntawm no yog qhov me me vim tias lub xovtooj ntawm tes no zoo li tau txais lub xeev sib npaug. Qhov sib npaug los thaum cov concentrations ntawm ob lub hlwb ib nrab ua sib npaug.
Lub cell concentration tsim hluav taws xob los ntawm kev txo qis ntawm lub zog tsis muaj zog ntawm lub cev. Txij li thaum muaj pes tsawg leeg ntawm ib nrab hlwb zoo sib xws, tib cov tshuaj tiv thaiv tshwm sim, tab sis nyob rau hauv opposite lus qhia. Cov txheej txheem no ua rau kom cov concentration ntawm qis concentration ntawm tes thiab txo cov concentration ntawm ntau dua concentration cell. Raws li cov hluav taws xob ntws, thermal zog yog generated. Lub cell absorbs lub zog no raws li cua sov. Muaj ob hom ntawm cov cell concentration raws li hauv qab no:
- Electrolyte concentration cell - cov electrodes yog tsim los ntawm tib yam khoom, thiab ib nrab hlwb muaj tib lub electrolyte nrog ntau concentrations
- Electrode concentration cell - ob lub electrodes (ntawm tib yam khoom) ntawm cov concentrations sib txawv yog dipped nyob rau hauv tib electrolyte
Qhov txawv ntawm Galvanic Cell thiab Concentration Cell yog dab tsi?
Ib galvanic cell yog ib hom electrochemical cell uas siv cov tshuaj tiv thaiv redox los tsim hluav taws xob. Ib tug concentration cell, ntawm qhov tod tes, yog ib hom galvanic cell nyob rau hauv uas ob ib nrab ntawm lub cell zoo sib xws nyob rau hauv muaj pes tsawg leeg. Yog li ntawd, qhov sib txawv tseem ceeb ntawm galvanic cell thiab concentration cell yog tias galvanic cell yuav los yog tsis muaj ob ib nrab hlwb nrog tib muaj pes tsawg leeg whereas concentration cell muaj ob ib nrab hlwb nrog tib muaj pes tsawg leeg.
Ntxiv mus, cov electrodes ntawm galvanic cell tuaj yeem ua los ntawm tib yam khoom lossis cov khoom sib txawv thaum cov electrodes ntawm cov cell concentration yog ua los ntawm tib yam khoom nrog tib lub concentration lossis sib txawv concentrations. Ntxiv rau cov no, galvanic hlwb muaj tib lub electrolyte los yog sib txawv electrolytes nyob rau hauv ob ib nrab hlwb thaum concentration cells muaj tib lub electrolyte nrog ob qho tib si concentration los yog txawv concentrations.
Cov lus qhia hauv qab no qhia txog qhov sib txawv ntawm galvanic cell thiab concentration cell.
Summary – Galvanic Cell vs Concentration Cell
Ib galvanic cell yog ib hom electrochemical cell uas siv cov tshuaj tiv thaiv redox los tsim hluav taws xob. Concentration cell yog ib hom galvanic cell nyob rau hauv uas ob ib nrab ntawm cov cell zoo sib xws nyob rau hauv muaj pes tsawg leeg. Yog li ntawd, qhov sib txawv tseem ceeb ntawm galvanic cell thiab concentration cell yog tias galvanic cell yuav los yog tsis muaj ob ib nrab hlwb nrog tib cov muaj pes tsawg leeg whereas concentration cell muaj ob ib nrab hlwb nrog tib muaj pes tsawg leeg.
