Chemistry-Common ions

posted by .

c=Calculate the OH- conc in a solution containing 6.2x10(-3)M Ba(OH)2 and 1.00x10(-2)M BaCl2?

I thought of using the BaCl2 conc to find the conc of Ba initially, then use that in the ice table for Ba(OH)2, and solve for OH. But i dnot think that's right.
Help? :/

  • Chemistry-Common ions -

    I wonder if this problem expects us to use a Ksp for Ba(OH)2 or not. If not I see no reason to have included the concn of BaCl2. (And note that Ba(OH)2 is quite soluble--I've never even looked for a Ksp for it).(Another note: look in your text and see if Ksp is listed for Ba(OH)2 in Ksp tables. If so we should use it. If not, we don't use it. :-)]

    Assume not a Ksp problem.
    Then Ba(OH)2 --> Ba^2+ + 2OH^-
    If [Ba(OH)2] = 0.0062M then OH^- is twice that.

    If you think it is a Ksp problem then use the BaCl2 as a common ion and solve for OH^-. Repost if you get stuck and explain the problem.

  • Chemistry-Common ions -

    Woooo! the easy way was correct c: Thanks man. But i still kinda don't know why you just doubled it. I thought it would havesomething to do witht he ice table and such since it was in the common ion+buffer chapter :s

    Care explaining or?

  • Chemistry-Common ions -

    You want an ICE chart?
    .........Ba(OH)2 ==> Ba^2+ + 2OH^-
    initial..0.0062M......0........0
    change..-0.0062......0.0062...2*0.0062
    equil....0..........0.0062M..0.0134M

    But I didn't do all of that in my mind. I looked at Ba(OH)2, I see there are 2 OH^- per molecule of Ba(OH)2 and the problem tells me the [Ba(OH)2] = 0.0062M so I know OH^- is twice that.

  • Chemistry-Common ions -

    Wow im an idiot XD thanks.
    And i don't want to be a nuisance, but how would i do the next question?
    0.320M (NH4)2SO4 and 0.492M NH3
    (Still looking for OH- conc)

    Would i find the H+ concentration from the double dissociation of the NH4compound? (i know how to find the oh from there)

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. chem

    can someone plz help me with this? What mass of sucrose (C12H22O11) must be dissolved to make 460 mL of a 1.10M solution?
  2. pH

    im trying to calculate the pH of a 1.0L soln containing 53.8 g of completely dissociated Mg(CN)2. is this the diss. equation?
  3. Science, Chemistry

    I have been told that to prepare 1L of 70% H2SO4 from concentrated sulphuric acid (96% with density 1.84g/ml), I should use the following equation to find out the volume of conc. acid needed (Vml). V x 1.84 x 0.96={(1000-V)+ 1.84V}0.7 …
  4. Chemistry help needed

    How do I prepare 90% formic acid from conc. formic acid (98%-100% of density 1.22g/ml)?
  5. chem

    the pH of a .100 M solution of sodium formate = 8.37. Calculate the value of Ka of formic acid. okay so I know that the anion of a weak acid is itself a weak base so A- +H2O---> OH- + HA pOH =14-8.37 so conc of OH is 10^-5.63 Ka=[OH][HA]/[A-] …
  6. Chemistry

    I did an experiment on Buffers: In a polystyrene beaker, mix 20 ml of 0.1M Acetic acid ad 25 ml of 0.1 M sodium acetate and immediately measure the pH. Remove the electrode and add 5 ml of 0.1 M HCL to this buffer. Stir the solution …
  7. chemistry-help!

    The initial rate of reaction for H2O2(aq) <-> H2O (l) 1/2 O2 (g) is found to be 1.7x10(-3)M/s. Assume that this rate holds for 2 minutes. Start with 160ml of 1.60 M H2O2. How many milliliters of O2 measured at 24C and 760mmHg …
  8. Chemistry

    A solution is made by dissolving 1.0 mole of Na2SO4(ionic compound) into water to get 1.0L of solution. Give the conc of all the ions present in solution in M?
  9. Chemistry

    How to differ AgBr from AgI? which is suitable for that among these...?
  10. Chemistry

    I need help with this problem Which acid of those is used to destinguish between FeO and Fe2O3 a-HCl conc. b-HCl dil. C-H2SO4 conc. And how

More Similar Questions