Chemistry

Name: _____________________________

Titration Curves Worksheet 1. During a titration, a student adds water from a wash bottle to wash down some reactant solution that has splashed up in the Erlenmeyer flask. Although this changes the volume of the solution in the flask, she is confident that the accuracy of the titration will not be affected. Do you agree or disagree? Explain your answer.

2. A student must titrate a 25.0 mL sample of acetic acid solution whose concentration is known to be approximately 0.2 M. After adding a small amount of phenolphthalein indicator to the reaction flask, the student fills a 50 mL burette with a standardized 0.0650 M solution of NaOH and prepares to begin the titration. His lab partner insists that the titration cannot succeed. Do you agree or disagree with the lab partner? Explain your answer.

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Chemistry

Name: _____________________________

3. Methylamine, CH3NH2, is found in herring brine solutions, used in the manufacture of some pesticides, and serves as a solvent for many organic compounds. A titration is performed to determine the concentration of methylamine present in a solution being prepared for a commercial pesticide. A 0.185 M HCl solution is added to 50.0 mL samples of aqueous methylamine in three separate titration trials. The data table below shows the results. Calculate the concentration of the methylamine solution.

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