1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Molarity and Oxidation states

  1. Oct 27, 2008 #1
    1. The problem statement, all variables and given/known data

    I wasn't sure about some of these problems, am I doing them correctly?

    1) What volume of each of the following bases will react completely with 25.00 mL of 0.200 M of HCl?

    a) 0.100 M NaOH

    .02500 L x .200 mol HCl/1 L = .00500 mol HCl

    .100 M NaOH = .00500 mol NaOH/v ~ v = .0500 L NaOH

    b) 0.0500 M Ba(OH)2

    .0500 M Ba(OH)2 = .00500 mol HCl/v ~ v = .100 L Ba(OH)2

    c) .250 M KOH = .00500 mol KOH/v ~ v = .0200 L KOH

    2) Assign oxidation states for all atoms in each of the following compounds:

    a) KMnO4
    K: -1
    O: -2
    Mn: +7


    b) Hg2Cl2
    Hg: +1
    Cl: -1


    c) NaBiO3
    Na: +1
    Bi: +5
    O: -2


    d) CO
    C: +2
    O: -2


    e) Ca(NO3)2
    Ca: +2
    N: +5
    O: -2


    f) HAsO2
    H: +1
    As: +3
    O: -2


    3) Specify which of the following are redox reactions, and identify the oxidizing agent, the reducing agent, the substance being oxidized, and the substance being reduced.

    a) HCl (g) + NH3 (g) --> NH4Cl (s)

    -- not a redox reaction

    b) Cu (s) + 2Ag+ (aq) --> 2Ag (s) + Cu2+ (aq)

    Oxidized: Cu

    oxidizing agent: Ag+

    Reduced: Ag+

    Reducing agent: Cu
     
  2. jcsd
  3. Oct 27, 2008 #2

    Borek

    User Avatar

    Staff: Mentor

    In what molar ratio do they react?

    Alkali metals in compounds have always the same ON, and it is not -1.
     
  4. Oct 27, 2008 #3
    2HCl + Ba(OH)2 --> BaCl2 + 2H2O

    HCl and Ba(OH)2 react in a 2:1 ratio, I realized that after I posted the thread; so the volume of Ba(OH)2 is 0.0500 L?



    That was a typo, I meant to say K: +1.
     
  5. Oct 27, 2008 #4

    Borek

    User Avatar

    Staff: Mentor

    100% OK now.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Molarity and Oxidation states
  1. Find oxidation state (Replies: 3)

  2. Oxidation state of Ni (Replies: 0)

Loading...