1. Questions

AP Chem

Redox Titrations:

a. write 2-3 sentences describing and identifying the type of chemical reaction that occurs when Fe2+ reacts with potassium permanganate (KMnO4) and specifying the type of solution for the reaction to occur.

b. using a standard reduction potential table, identify the oxidation and reduction half-reactions for the reaction.

c. write the balanced net ionic equation for the reaction, and identify which substance is oxidized and which is reduced.

d. Suppose at the endpoint of the reaction 0.030 moles of KMnO4 were added to the analyte. How many moles of Fe2+ were contained in the beaker?

This is urgent! I really need help with this. I have no idea where to even begin. Thank you!!

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chemstudent

  1. Hmm, I'm not sure. Anyone else get it?

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    jiskhaaaaa

  2. Would it just be a redox reaction for part a?

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    jiskhaaaaa

  4. I need help, somebody understand this please!!

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    chemstudent

  5. Redox Titrations:

    a. write 2-3 sentences describing and identifying the type of chemical reaction that occurs when Fe2+ reacts with potassium permanganate (KMnO4) and specifying the type of solution for the reaction to occur.
    I don't know why you need more than one word to describe a redox reaction. These titrations with ferrous and permangante usually are carried out in an acidic solution

    b. using a standard reduction potential table, identify the oxidation and reduction half-reactions for the reaction.
    The obvious place to start here is to look up the standard reduction potentials. The oxidation half is the more negative of the two.
    c. write the balanced net ionic equation for the reaction, and identify which substance is oxidized and which is reduced.
    5Fe^2+ MnO4^- + 8H^+ ==> 5Fe^3+ + 4H2O + Mn^2+
    You add the phases if that is required.

    d. Suppose at the endpoint of the reaction 0.030 moles of KMnO4 were added to the analyte. How many moles of Fe2+ were contained in the beaker?
    Do you mean it took 0.030 mols KMnO4 to reach the end point. If so then 0.030 mols KMnO4 x (5 mols Fe^2+/1 mol KMnO4) = ?
    Post your work if you have other questions about this.

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    DrBob222

  6. Ok so how would I find the reduction potential for KMnO4?

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    chemstudent

  8. also, for the net ionic equation, you write MnO4 but it should be KMnO4?

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    chemstudent

  9. For the reduction potential for KMnO4 look in the tables. Should be in your text or you can find it on the web. You will find two values; one in acid solution and one in basic solution. You want the acid one. I think it's about -1.52 volts but you should confirm that. As for the KMnO4 vs MnO4^- note that they asked for the NET IONIC EQUATION. If you use KMnO4 it is the molecular equation. They asked for the IONIC EQUATION so you use MnO4^-. Also note that Fe^2+ is the ionic part and the anion of Ferrous is not listed.

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    DrBob222

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