plexus0208 said:Am I supposed to use the equation pH = pKa + log [A-]/[HA]?
The purpose of titrating trimethylamine with HCl (g) is to determine the concentration of the trimethylamine solution. This is done by adding a known concentration of HCl (g) to the trimethylamine solution until the reaction reaches its equivalence point, where the moles of acid are equal to the moles of base. By measuring the volume of acid added at the equivalence point, the concentration of the trimethylamine solution can be calculated using the equation M1V1 = M2V2.
The equipment needed for titration of trimethylamine with HCl (g) includes a burette, pipette, volumetric flask, beaker, Erlenmeyer flask, magnetic stirrer, and a pH meter. Other materials such as distilled water, indicator, and a balance may also be necessary depending on the specific experiment.
The indicator is used to signal the endpoint of the titration, which is when the reaction between trimethylamine and HCl (g) is complete. This is typically achieved by using a pH indicator that changes color at a specific pH, indicating that the equivalence point has been reached.
The concentration of the HCl (g) solution is determined by using the known concentration of the trimethylamine solution and the volume of acid added at the equivalence point. By rearranging the equation M1V1 = M2V2, the concentration of the HCl (g) solution can be calculated.
Sources of error in titration of trimethylamine with HCl (g) can include inaccurate measurements of volumes or concentrations, incomplete mixing of the solutions, and the presence of impurities in the solutions. It is important to carefully follow the experimental procedure and use precise equipment to minimize these sources of error.