Zadanie 31
Wzorowane na: Chemistry HL Paper 1, November 2024, pytanie 31. Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Polecenie
A half-cell of metal X in a 1.00 mol dm−3 solution of X2+ ions is connected to a standard hydrogen electrode (SHE). The voltmeter reads 0.34 V and the X electrode is the positive terminal.
Which statement is correct?
A. The standard electrode potential of the SHE is +0.34 V.
B. The standard electrode potential of the X half-cell is +0.34 V.
C. The standard electrode potential of the X half-cell is −0.34 V.
D. Hydrogen ions are reduced at the SHE.
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
B ✔
«the SHE is assigned E⊖ = 0.00 V by convention, so the measured cell voltage is the electrode potential of the other half-cell; the X electrode is the positive terminal, where reduction (X2+ + 2 e− → X) occurs, so E⊖(X2+/X) = +0.34 V, and at the SHE hydrogen is oxidized»
Schemat punktowania
One mark for the correct option.