Homework Help: CHEMISTRY

Posted by sabrina on Friday, November 30, 2012 at 11:23pm.

Use the Nernst equation and data from Appendix D to calculate Ecell for each of the following cells.

Enter your answer with 3 significant digits.
Enter scientific notation as 1.23E4.

(a) Mn(s) | Mn2+(0.11) M || Cr3+(0.24 M), Cr2+(0.11 M) | Pt(s)

____________

(b) Mg(s) | Mg2+(0.070) M || [Al(OH)4]–(0.30 M), OH–(0.040 M) | Al(s)

CHEMISTRY - DrBob222, Friday, November 30, 2012 at 11:48pm
a) Mn(s) | Mn2+(0.11) M || Cr3+(0.24 M), Cr2+(0.11 M) | Pt(s)

1. Calculate4 the Mn^2+ + e ==> Mn couple.
E = Eo - 0.0592/n)*log(red/(ox)
E = Eo-(0.0592/n)*log[Mn(s)]/(Mn^2+)
E = Eo = (0.0592/2)*log[(1)/(0.11)]
You will need ot look up Eo for this REDUCTION, calculate E for the half cell, then change the sign since this is an oxidation.

Do the same for the Cr^3+ + e ==> Cr^2+

Then EMn as oxidation + ECr as redn = Ecell.

Answer this Question

Related Questions

CHEMISTRY - Use the Nernst equation to calculate Ecell for each of the following...
CHEMISTRY - Use the Nernst equation and calculate Ecell for each of the ...
Chemistry PLEASE!! - how do i calculate a concentration ratio of oxidised to ...
Chemistry - The cell Pt|H2(1 bar)|HCl(m)|AgCl(s)|Ag has an Stadard elctrode ...
Any chemistry lovers? - A voltaic cell consists of Mn/Mn2+ and Cd/Cd2+ half-...
physiology (nernst equation) - If cell depolarises at +50mV, what are the ...
chemistry - A voltaic cell at 25oC consists of Mn/Mn2+ and Cd/Cd2+ half-cells ...
CHEMISTRY - cell diagram:H2(g,1atm) Pt Enter part(a), (c) with 2 siginificant ...
chemistry - Calculate the reduction potential of the following solutions: a- 1 M...
CHEMISTRY - Enter part(a), (c) with 2 siginificant digits and part(b) with 3 ...

For Further Reading

First Name:
School Subject:
Answer: