Exercises - Alkali Metals

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Chapter: Essentials of Inorganic Chemistry : Alkali Metals

1. Determine the oxidation state for all elements in the following molecules 2. Complete the reduction and oxidation equation and write the redox equation in the following examples 3. Complete the equation and indicate the standard reduction potential Ered assuming both reac-tions partners are used in the same concentration. 4. Calculate E for the following redox pair


Exercises

 

1. Determine the oxidation state for all elements in the following molecules:

(a)        H2O

(b)       NaCl

(c)        H2O2

(d)       Fe2O3

(e)        MnO4

(f)         Cr2O72−

(g)        SiH4

 

2. Complete the reduction and oxidation equation and write the redox equation in the following examples:

(a) MnO4 + Fe2++ ???? Mn2+ + Fe3++ ?????? under acidic conditions

(b) MnO4 + Br + OH ??? + BrO3  under basic conditions

(c) Cr2O72− + Cu+ Cu2++ ??? under acidic conditions

(d) IO3 + I I2  under acidic conditions

 

3. Complete the equation and indicate the standard reduction potential Ered assuming both reac-tions partners are used in the same concentration.

(a) Br2 + 2I ???? E0(Br2∕Br) = 1.07 V

E0(I2∕I) = 0.54V

(b) Fe2+ + Ce4+ ???? E0(Ce4+∕Ce3+) = 1.61 V

E0(Fe3+∕Fe2+) = 0.77 V

(c) Br2 + Fe ???? E0(Br2∕Br )=107V

E0(Fe2+∕Fe) = −0.44 V

 

4. Calculate E for the following redox pair when Mn3+= 0.5 M and Mn2+ = 0.01 M [E0(Mn3+/Mn2+) = 1.51 V] using the Nernst equation.


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