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A buffer was made by mixing 0.1522 moles of HCO2H with 0.1832 moles LiHCO2- and diluting to exactly 1L. What will be the pH after addition of 10ml of 0.3657M NaOH to 50mL of the buffer. Ka(HCO2H) = 1.8*10-4

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Jude

  1. In 50 mL of the buffer you will have
    millimoles COO- = 50 mL x 0.18322M = 9.160
    mmoles HCOOH = 50mL x 0.1522 = 7.610
    mmols NaOH added = 10 mL x 0.3657 = 3.657
    ...........HCOOH + OH^= ==> HCOO^- + H2O
    initial....7.610....0........9.160
    add................3.657............
    change.....-3.657..-3.657..+3.657..3.657
    equil..... sum.......0......sum......sum

    Substitute into the HH equation and solve for pH.

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    DrBob222

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