Just a reminder that everything you do related to lab should be entered directly into your lab notebook.
Determination of Acetic Acid in Vinegar
Objectives:
After completing this lab, you should be able to
- Calculate the mass of a solid reagent required to prepare a solution of a given concentration.
- Use the appropriate glassware to mix and store aqueous solutions.
- Use a buret to perform an acid-base titration.
- Calculate the molarity and mass percent of an unknown analyte based on the results of a titration.
Safety:
Safety glasses must be worn at all times in the lab. Sodium hydroxide and oxalic acid dihydrate
are corrosive in case of skin or eye contact and toxic when ingested. Avoid contact with the dry
reagents and solutions. MSDS sheets for all of the compounds used in this procedure are available in the
lab.
Resources:
Lab Text Chapter IV
Titration Video
Solution Process at the Atomic Level
Introduction
Titrations are among the most commonly used and accurate methods of determining the amount
of analyte in an unknown solution. In this procedure you will be performing two titrations, one to
determine the concentration of the sodium hydroxide solution prepared in Part I and another to
determine the concentration of acetic acid in a sample of vinegar. Each of these is an example of an
acid-base titration. The net ionic equation for any acid-base titration is shown below
H+ (aq) + OH (aq)- H2O (l)
When the number of equivalents of titrant is equal to the number of equivalents of analyte, a visual
indicator, in this case phenolphthalein, changes color signaling the endpoint of the titration.
Determination of Acetic Acid in Vinegar
Objectives:
After completing this lab, you should be able to
- Calculate the mass of a solid reagent required to prepare a solution of a given concentration.
- Use the appropriate glassware to mix and store aqueous solutions.
- Use a buret to perform an acid-base titration.
- Calculate the molarity and mass percent of an unknown analyte based on the results of a titration.
Safety:
Safety glasses must be worn at all times in the lab. Sodium hydroxide and oxalic acid dihydrate
are corrosive in case of skin or eye contact and toxic when ingested. Avoid contact with the dry
reagents and solutions. MSDS sheets for all of the compounds used in this procedure are available in the
lab.
Resources:
Lab Text Chapter IV
Titration Video
Solution Process at the Atomic Level
Introduction
Titrations are among the most commonly used and accurate methods of determining the amount
of analyte in an unknown solution. In this procedure you will be performing two titrations, one to
determine the concentration of the sodium hydroxide solution prepared in Part I and another to
determine the concentration of acetic acid in a sample of vinegar. Each of these is an example of an
acid-base titration. The net ionic equation for any acid-base titration is shown below
H+ (aq) + OH (aq)- H2O (l)
When the number of equivalents of titrant is equal to the number of equivalents of analyte, a visual
indicator, in this case phenolphthalein, changes color signaling the endpoint of the titration.
