Seperation and Qualitative Analysis of Cations Post Lab Please help me finish th

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Seperation and Qualitative Analysis of Cations Post Lab

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3. Write half-reactions that show how H2O2 n act as either an oxidizing agent or a reducing agent, and describe where each of these situations occurred in your testing. 4. In your testing, several precipitates are formed, and then dissolved as complexes. Select three of these situations for which to write a balanced reaction equation. 5. When Mrkio e mixture they Write the reaction equations thatdeseti 6. The NH3 solution is used, in three separate instances, to separate two ions. In each of these cases, one ion forms a precipitate and the other ion remains in solution as a complex. Describe each of these instances, using reaction equations.

Explanation / Answer

3. H2O2 acts as both oxidizing agent and an reducing agent.

With H2S it acts as oxidizing agent

H2S + H2O2 ---> S + 2H2O

with Cl2 a string oxidizing gent it acts an an reducing agent

Cl2 + H2O2 --> 2HCl + O2

In the current experiment Mn2+ is oxidized to Mn4+ by H2O2.

4. Formation and dissoltuion of precipitate

Cu2+ + 2OH- ---> Cu(OH)2 (ppt) + 4NH3 ---> Cu(NH3)4]2+(aq) + 3OH-

Fe3+ + 3OH- ==> Fe(OH)3(ppt) + SCN- ---> [FeSCN]2+(doluble)

A3+ + 3OH0= --> Al(OH)3(ppt) + OH- ---.> [Al(OH)4]- (soluble)

5. Ag+ and Pn2+

Ag+ + 2NH3 --> [Ag(NH3)2]+ (soluble)

Pb2+ + 2OH- --> P(OH)2(ppt)

Al3+ and Zn2+ (with NH3 + OH --NH4OH)

Al3+ + 3OH- --> Al(OH)3(ppt)

Zn2+ + OH- --> Zn(OH)2(soluble)

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