Diagram of Energy States and Transition in The Hydrogen Atom Lab

EXAMPLE OF PRE-LAB MOLAR MASS OF AN UNKNOWN ACID Pre-lab (In the Notebook)

PURPOSE

The purpose of the experiment is to determine the molar mass of an unknown acid by titration with a standardized base.PROCEDURE After obtaining a solid sample of an unknown acid, approximately 3.2 g will be distributed among three 125 mL Erlenmeyer flasks. Using analytical techniques, the precise mass of acid in each flask will be determined by recording the mass of each flask before and after the addition of approximately 1/4 the total acid sample. Each of the three acid samples in the flasks will be dissolved in DI water (approximately 25 mL) and 2–3 drops of phenolphthalein will be added prior to titration. Each dissolved acid sample will be titrated with the sodium hydroxide solution standardized from the previous experiment: [OH-] = 0.1078 M.FUN FACT The technique of titration is used in the process of biodiesel to help remove the fatty acids in water vegetable oil (WVO) that would normally react to make soap instead of biodiesel. A sample titration process is done to help determine the acidity of a sample of WVO so the rest of the batch can be neutralized properly.SAFETY Sodium Hydroxide, NaOH, is a strong base and may cause severe chemical burns. Avoid contact with skin and eyes. Given that the formula of the acid is unknown, the same safety precautions should be applied to the acid. As always, goggles, lab apron/ coat, pants, and closed-toe shoes will be worn at all times

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