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March 28, 2017

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Find the pH of a solution prepared by taking a 50.0 mL aliquot of a solution prepared by dissolving 12.25g of NaOH and 250.0 mL of water and diluting that aliquot to 1.00L?

  • Chemistry - ,

    12.25 g NaOH = ?? moles
    moles = grams/molar mass = 12.25/40 = about 0.3 moles (you need to do it more accurately).
    Place that in 250 mL and the molarity is
    M = moles/L = 0.3/0.25 = about 1.2 M.
    The concn of the diluted aliquot then is about 1.2 x (50/1000) = about 0.061
    This is a solution of a strong base since NaOH ionizes 100%; therefore,
    pOH = -log(OH^-) = -log(0.06) = about 1.2 and pH + pOH = 14. Solve for pH.

  • Chemistry - ,

    12.79

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