Vinegar Titration

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Vinegar Titration

  1. 1. Neutralizing an Acid Aim To be able to calculate the concentration acid in vinegar.
  2. 2. Context Titration – this is a technique that can be used to find out the concentration of a solution. It can be used for quality control, by forensic scientists and pharmacists to make medicines. You will be given a sample of vinegar and need to check if it has been watered down or not. You will be told the concentration of ethanoic acid it is supposed to contain and must check to see if it is correct.
  3. 3. Risk Assessment
  4. 4. Equipment Diagram
  5. 5. Method <ul><li>Using a pipette, measure out 25ml of vinegar. </li></ul><ul><li>2. Add 2-4 drops of phenolphthalein </li></ul><ul><li>indicator to the acid. </li></ul><ul><li>3. Fill the burette to the 0ml mark with sodium </li></ul><ul><li>hydroxide. </li></ul><ul><li>3. Turn the stop-cock on the burette and </li></ul><ul><li>release the sodium hydroxide until the vinegar </li></ul><ul><li>turns pink. </li></ul><ul><li>Record the sodium hydroxide reading in a table. </li></ul>
  6. 6. Results Average Volume of sodium hydroxide (ml) Test
  7. 7. Analysis Neutralization happens when… The word equation for this reaction is… The balanced symbol for this reaction is… The concentration of ethanoic acid in vinegar was… The calculation to show this is…
  8. 8. To calculate the concentration of ethanoic acid in the vinegar you need to: Calculate the moles of sodium hydroxide used= volume in dm 3 x concentration Use this value to work out concentration of ethanoic acid = moles  volume in dm 3 Analysis and Evaluation
  9. 9. Evaluation My experiment went… I did not have problems with… because… I had problems with … because… To improve my experiment I could… My results would be more reliable if I… Did you have any results that look out of place? (Was the amount of sodium hydroxide needed to neutralize the acid very high or very low?) If so, how might this have happened?

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