the correct net-ionic equation of the reactions, in aqueous medium.

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Cd(s) reduces Co2+(aq)

Mn(s) reduces Ni2+(aq)

 Sn2+(aq) oxidizes Co(s)


Which of the following are oxidation-reduction reactions? 
 H+(aq) + HS(aq) → H2S(g) 
Ca(s) + 2HCl(aq) → CaCl2(aq) + H2(g) 
2K(s) + I2(s) → 2KI(s) 
 Fe(s) + 2AgNO3(aq) → Fe(NO3)2(aq) + 2Ag(s)

Which the foll aqueous solutions can be safely stored in a copper container? 

NiCl2
 MgCl2
HNO3
HI
Hg(NO3)2



May 13th, 2015

Cd0(s) ---------- Cd2+ + 2e-

Co2+ + 2e- --------- Co0(s)

NET EQUATION:

Cd0(s) + Co2+ ----------- Cd2+ + Co0(s)

Mn0(s) ---------- Mn2+ +2e-

Ni2+ + 2e- --------- Ni0(s)

NET EQUATION:

Mn0(s) + Ni2+ -------- Mn2+ + Ni0(s)

Co0(s) ----------- Co2+ + 2e-

Sn2+ + 2e- ---------- Sn0(s)

NET EQUATION:

Co0(s) + Sn2+ ------------- Co2+ + Sn0(s)

All of the reactions in question# 2 are oxidation-reduction reactions.

   H+(aq) + HS(aq) → H22+S2-(g)

Ca0(s) + 2H+1 Cl-1(aq) → Ca2+ Cl22-(aq) + H20(g)

2K0(s) + I20(s) → 2K+1 I-1(s) 

Fe0(s) + 2Ag+1( NO3)-1(aq) → Fe2+ (NO3)2(aq) + 2Ag0(s)

NiCl2, MgCl2 and Hg(NO3)2 can be stored in copper containeter but not the remaining two because they are acids and they'll favor the oxidation of copper in the copper conatainer and the copper container gets rusted

May 13th, 2015

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May 13th, 2015
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May 13th, 2015
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