In die elektrochimiese sel wat hieronder getoon word, word 'n aluminium-elektrode en 'n ander metaalelektrode, Y, gebruik - NSC Physical Sciences - Question 8 - 2017 - Paper 2
Question 8
In die elektrochimiese sel wat hieronder getoon word, word 'n aluminium-elektrode en 'n ander metaalelektrode, Y, gebruik.
Daar word gevind dat die massa van die al... show full transcript
Worked Solution & Example Answer:In die elektrochimiese sel wat hieronder getoon word, word 'n aluminium-elektrode en 'n ander metaalelektrode, Y, gebruik - NSC Physical Sciences - Question 8 - 2017 - Paper 2
Step 1
8.1.1 Naam van komponent Q
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Answer
Die komponent Q is 'n soutbrug.
Step 2
8.1.2 Soort elektrochimiese sel wat hierbo voorgestel word
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Answer
Dit is 'n galvaniese sel.
Step 3
8.2.1 Die konsentrasie van A²⁺(aq)
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Die konsentrasie van A²⁺(aq) sal VERLAAG omdat die ionen in oplossing verminder wanneer die sel in werking is.
Step 4
8.2.2 Die konsentrasie van Y²⁺(aq)
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Die konsentrasie van Y²⁺(aq) sal VERHOOG omdat die ionen vrygestel word in oplossing wanneer die sel in werking is.
Step 5
8.3.1 Halfreaksie wat by elektrode Y plaasvind
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Answer
Die halfreaksie is:
Y(s) → Y²⁺(aq) + 2e⁻.
Step 6
8.3.2 Selnotasie van die sel
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Die selnotasie is:
A²⁺(aq) | A(s) || Y²⁺(aq) | Y(s).
Step 7
8.4 Die aanvanklike metaal Y met behulp van 'n berekening.
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Answer
Om metaal Y te identifiseer, kan ons die standaardpotensiaal gebruik. As ons die waarde van E° vasstel, vind ons Y = Mg, omdat E° = -2.36 V.
