A voltaic cell is prepared in which aluminum metal is oxidized to Al3+, and nickel(II) is reduced to nickel metal. Which of the following represents the correctly balanced equation for this reaction?
Answer
Al(s) + Ni2+(aq) ? Al3+(aq) + Ni(s)
Al(s) + 2Ni2+(aq) ? Al3+(aq) + 2Ni(s)
2Al(s) + 3Ni2+(aq) ? 2Al3+(aq) + 3Ni(s)
Al3+(aq) + 2Ni(s) ? Al(s) + 2Ni2+(aq)
2Al3+(aq) + 3Ni(s) ? 2Al(s) + 3Ni2+(aq)