The Investigation about Titration being used in Vinegar
Objective: To find out how much acetic acid is in vinegar
When the concentration of an acid is unknown, a titrant of the known concentration is used. The titrant is usually added, drop by drop, into the acid until it is completely
neutralized by the base. What this experiment will test is the concentration of the acid. What will be tested is common vinegar and apple cider vinegar, since both have a percent of acetic acid(5%) in both of them.
1. 1 24 well microplate
2. 1% of acetic solution
3. Phenophthalein indicator
4. Apple cider vinegar
5. Common vinegar
6. 4 test tubes
1. Place 10 drops of 1% acetic acid solution in well A1 of the 24 microplate. Add 1 drop of phenophthalein indicator to the same well.
2. Fill the burette with the 0.1M sodium hydroxide and return the burette ti the holder.
3. Carefully counting the drops, add the 0.1M sodium hydroxide solution to the acetic acid solution, drop by drop, until the phenophthalein turns a light pink color which persists for more than 30 seconds,. Record the number of drops.
4. Discard the solution in well A1 and rinse the well with distilled water. Rinse the toothpick of plastic stirrer and dry with a paper towel or filter paper.
5. Repeat steps 2 through 5 at least twice more. Average your results...