Write balanced chemical equations from the following shorthand notations. Use no
ID: 561799 • Letter: W
Question
Write balanced chemical equations from the following shorthand notations. Use no special characters for subscripts and superscripts and include the coefficient with the substance. 3Fe2+ should be written as 3Fe2+. Note that Ox1 and Red2 are the oxidizing and reducing agents, and Red1 and Ox2 are the other half of their couples.
a) Cu/Cu2+//Ag1+/Ag
b) Pb/Pb2+ // Fe2+, Fe3+/Pt
c) Pt/H1+,H2//Cu2+/Cu
d) Cr/Cr3+//H1+,H2//Pt
Please help with parts b) through d) I don't understand why my answer for part b) is wrong. My original answer to Red2 of part b) was 3Fe2+ a typo and should have been 2Fe2+, but it was marked wrong as well, so I am wondering if the platinum changes the way it is written. Please show all work! Thank you in advance!
Ox1 + Red2 Red1 + Ox2 + +Explanation / Answer
a)
Cu is oxidised and Ag is reduced.
Cu = Cu2+
Ag+ = Ag
2Ag+ + Cu = 2Ag + Cu2+
b)
Pb is oxidised to Pb2+ and Fe3+ is reduced to Fe2+
Pb = Pb2+
Fe3+ = Fe2+
2Fe3+ + Pb = 2Fe2+ +Pb2+
Red2 is Pb as Pb is oxidised to Pb2+ and itself acts as reducing agent.
c) H2 is oxidised to H+ and Cu2+ is reduced to Cu.
Cu2+ = Cu
H2 = H^+
Cu2+ + H2 = Cu + 2H^+
d)
Cr is oxidised to Cr3+ and H+ is reduced to H2
2H+ = H2
Cr = Cr3+
6H+ +2Cr = 3H2 + 2Cr3+
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