Chemistry

posted by .

Which of the following reagents would oxidize Cr to Cr2 , but not Fe to Fe3 ?

Ca Co Ca2+ Br2 Co2+ Br-

Which of the following reagents would oxidize Cu to Cu2 , but not Cl– to Cl2?

Br2 Ca Co2+ Co Br- Ca2+

  • Chemistry -

    For #1, find Cr^2+ +2e ==> Cr in the tables. You want the reverse of this or Cr ==> Cr^2+ + 2e E = +0.91 so anything below it in your table will work. Find Fe ==> Fe^3+ + 3e and you want the reverse of that or
    Fe ==> Fe^3+ + 3e = ? I couldn't find that in my table. Thenlocate those elements/ions above. Any thing above Fe will not oxidize it and anything below Cr will oxidize it so those between the two will satisfy the question. Since I couldn't locate Fe I can't put any other numbers on this. One caution, Since Cr ==> Cr^2+ + 2e is an oxidation the other reaction MUST BE A REDUCTION; I.E.,
    metal ion + e ==> metal or
    non-metal + e ==> non-metal ion which eliminates Co (but perhaps not Co^2+) and Ca(perhaps not Ca^2+) and Br^- (but perhaps not Br2)

  • Chemistry -

    adfa

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. chemistry

    Why is it important that the sequence of addition of reagents be followed?
  2. chemistry

    Why is it important that the sequence of addition of reagents be followed?
  3. Chemistry

    Which reaction will occur if each substance is in its standard state?
  4. chemistry

    Which reagents reagents to choose? The transformation shown below can be accomplished in TWO reaction steps. From the following list, select the two reagents (or sets of reagents) which would most effectively bring about this conversion.
  5. Chemistry

    The transformation shown below can be accomplished in TWO reaction steps. From the following list, select the two reagents (or sets of reagents) which would most effectively bring about this conversion. Reagents: 1. Conc H2SO4/heat …
  6. Chemistry

    For the following electrochemical cell, what is the correct, balanced reaction?
  7. Chemistry

    The transformation shown below can be accomplished in TWO reaction steps. From the following list, select the two reagents (or sets of reagents) which would most effectively bring about this conversion. Reagents: 1. Conc H2SO4/heat …
  8. Chemistry

    Using a table of standard reduction potentials, determine the best answer to the following questions. a) Which of the following reagents would oxidize Cr to Cr3 , but not Ag to Ag ?
  9. Chemistry

    a) Which of the following reagents would oxidize Zn to Zn2 , but not Ag to Ag ?
  10. Chemistry

    What materials would be produced in the electrolysis of the following reagents?

More Similar Questions