Analytical Chemistry

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Consider the titration of 100.0 mL of 0.100 M NaOH with 1.00 M HBr. Find the pH at the following volumes of acid added and make a graph of pH versus Va: Va = 0,6 and 12 mL

  • Analytical Chemistry -

    HBr + NaOH ==> NaBr + H2O

    1. First you need to calculate the volume of HBr required to reach the equivalence
    mols NaOH = M x L = 0.1M x 0.1L =- 0.01
    mols HBr must be 0.01 to reach the equivalence point.
    Then M HBr = mols HBr/L HBr. Substitute to obtain 1M = 0.01/L and L = 0.01/1 = 0.01L or 10.0 mL of the 1.00 M HBr. That tells you that the 6.0 mL HBr is BEFORE the eq. pt. and 12.0 mL HBr is AFTER the eq. pt.
    a. at zero HBr.
    You have 0.1M NaOH; therefore, (OH^-) = 0.1. Convert that to pH.

    b. mols NaOH initially = 0.1M x 0.1L = 0.01.
    mols HBr added at 6 mL = 1M x 0.006 L = 0.006 mols
    0.01 mol NaOH - 0.006 mol HBr = 0.004 and since M = mols/L then 0.004/(0.106) = 0.0377. That is OH^-, convert to pH.
    I will leave c for you. That is after the equivalence point.

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