Description A titration is a common laboratory method used in analytical chemistry to determine the concentration of certain acids or bases during the production of certain biofuels, pharmaceutical drugs, and many other commercial products. In this assignment, you will perform an acid-base titration of an unknown acid. Instructions Your task is to conduct an acid-base titration. In this experiment, you will use the simulation from ChemCollective to determine the molar concentration of a weak monoprotic acid using a strong base of known volume and concentration. Select the link to open the Unknown Acid and Base simulation in another browser window. Unknown Acid and Base Problem (chemcollective.org) Select the File in the upper left corner to open the assignment. Choose Load an Assignment from the drop down list. In the Assignment list, select Acids and Bases. Scroll down to the Unknown Acid and Base Problem, and select the arrow to the right of the title. This will take you to the lab. Step 1: Setting Up The Work Bench Open the simulation on your browser and navigate to the Unknown Acid and Base Problem. The following steps are required to set-up the lab work bench. In the Stockroom there are three tabs: Solutions, Glassware, and Tools. Select the Solutions tab. In the list of solutions, select the Unknown Acid 0.1 L. This will place 100.00 mL of the unknown acid in an Erlenmeyer flask on the lab workbench. Return to the Stockroom. In the Solutions list, select Indicators. Choose the Phenolphthalein Indicator Solution from the list. The indicator will turn pink when you have passed the end point. Select and hold the bottle of Phenolphthalein and move it over the top of the flask containing the unknown acid. A measurement box will appear. Add 5.00 mL of indicator solution to the flask containing the unknown acid. Right click on the indicator bottle, and choose Remove to take it from the workbench. Return to the Stockroom. In the Solutions list, choose a Strong Base from the list of solutions. Make note of the type of base, the volume, and the molar concentration. Return to the Stockroom. In the Glassware list, select Other. from the drop down list, choose the 50.00 mL burette. This will place it on the lab work bench. Select and hold the flask containing the base, and move it over the top of the burette. A measurement box will appear.
Recent Comments