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March 28, 2017

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Complete the table below: Note: Make simplifying assumptions, do not use the quadratic formula.
What is the pH of the solution created by combining 11.80 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)?
with 8.00 mL of the 0.10 M HC2H3O2(aq)?


Complete the table below: Note: Make simplifying assumptions, do not use the quadratic formula.
What are the pH values if you take into account that the 8.00 mL of 0.10 M Acid was first diluted with 100 mL of water (like it will be in the experiment you perform in lab)?

  • chem - ,

    11.80 mL x 0.1M NaOH = 1.180 mmoles.
    8.00 mL x 0.1M HCl = 0.800 mmoles
    8.00 mL x 0.1M HAc = 0.800 mmoles.

    ............HCl + NaOH ==> NaCl + H2O
    initial..0.800...1.180.....0.......0
    change..-0.800..-0.800.....0.800.0.800
    equi.......0.....0.380.....0.800..0.800
    So you have 0.380 mmoles NaOH in 11.8+8.00 mL soln and (OH^-) = (NaOH) and convert to pH.

    ..........HAc + NaOH ==> NaAc + H2O
    initial..0.800..1.180.....0......0
    change..-0.800..-0.800..0.800..0.800
    equil....0......0.380...0.800..0.800
    Ignoring the OH^- that might be added due to the hydrolysis of the NaAc salt (which is negligible) pH is determined by the mmoles NaOH/mL.

    The second half is all yours. Post your work if you get stuck.

  • chem - ,

    im having trouble with the samee one....

    i got 1.72 for the pH and its still wrong

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