How to Observe Titration of Vinegar
In order to observe the titration of vinegar, you must add an indicator solution such as phenolphthalein to colorize the water and let you know when titration is complete. For 20 to 25 mL of vinegar, you must add 40 mL of distilled water and three drops of phenolphthalein. The sodium hydroxide solution should be added in doses of 1 to 2 mL at a time until the color of the vinegar mixture begins to change slightly, then drop by drop to finish up the titration process.
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Things You'll Need
- Vinegar
- Phenolphthalein
- Sodium hydroxide
- Distilled water
- Beaker
- Eye dropper
- Gloves
- Eye protection
Instructions
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1
Pour the appropriate amount of vinegar into a beaker --- the amount is up to you depending on your individual experiment. Dilute with distilled or deionized water.
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2
Add the phenolphthalein solution to the vinegar --- phenolphthalein is an indicator solution which will allow you to visually observe the titration process. At this point, the vinegar and phenolphthalein mixture will be colorless.
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3
Add sodium hydroxide to the vinegar and phenolphthalein mixture slowly --- drop by drop works well for small samples. Stir after each drop.
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4
Continue adding sodium hydroxide until the mixture turns light pink and remains that color for 30 seconds. Keep track of the amount of sodium hydroxide you use.
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1
Tips & Warnings
Be as accurate as possible when measuring solutions and mixtures.
Always wear gloves and eye protection when working with chemicals.
References
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