Acid-base titration

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Intros
Lessons
  1. What is titration?
  2. How titration works
  3. Finding unknown concentration: titration calculations.
  4. Titrations with partial neutralization.
  5. Percentage purity.
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Examples
Lessons
  1. Determine the unknown concentration from acid-base titration results:
    A solution of KOH of unknown concentration was titrated by 0.3 M hydrochloric acid. The results below show the volume of HCl required to titrate 25cm3 of the KOH solution:

    Run:

    Titre volume (cm3)

    1

    18.60

    2

    18.35

    3

    18.40

      1. Which two of these readings are concordant and should be used to find the average titre?
      2. Calculate the average titre for this experiment.
    1. Use your average titre to find the concentration of the potassium hydroxide (KOH) solution.
  2. Use an acid-base titration to calculate percentage purity of a sample.
    1.17g of sodium hydroxide pellets were used to make a 250mL solution of NaOH. 25.00 mL of this solution was titrated by 0.096 M HNO3, with an average titre of 27.75 mL.

    Use this information to find the percentage purity of the sodium hydroxide sample.