Chemistry - buffers

posted by Anonymous

Two burettes are filled with solutions: one with 0,1OM CH3COOH solution, second with 0,15M CH3COONa. How many milliliters each solution will need to make 20mL of solution, which pH=4.85

  1. DrBob222

    Use the Henderson-Hasselbalch equation.
    I would set base = millimols base = mLB*0.15.
    mmols acid = mLA(0.1M) = (20-mLB)*0.1
    Substitute and solve for mLB, then mLA.

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