Neutralization_1 - not dissolve immediately, stir for a...

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Completion of Experiment Perform a neutralization equivalent and include data and calculation in lab #5 and determine how close you are to the accepted molar mass (Neutralization Equivalent in this case). Include % error for neutralization equivalence in lab #4 calculations. The instructions for doing this follow: Accurately weigh your sample on the analytical balance. Ideally we should have about 0.1 g, but if you have less, it just means the titration will be less accurate. Transfer this to a 125-mL Erlenmeyer flask and dissolve in a 50:50 mixture of ethanol and water (about 25 mL). If it does
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Unformatted text preview: not dissolve immediately, stir for a while. Benzoic acid is not soluble in cold water and impurities may cloud it up. Add a few drops of Phenolphthalein indicator and titrate with standard NaOH to a faint pink endpoint. Please do not titrate too fast as you only get one chance!! Organic acids react a little slower. Be sure to record Buret # and all significant digits. Recall that the neutralization equivalent can be calculated from: NE = mg acid (molarity of NaOH x mL of NaOH added) Note: If your unknown was benzoic acid which has only one acidic group, the molar mass = NE...
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This note was uploaded on 07/03/2011 for the course CHEM 141 taught by Professor Matt during the Spring '11 term at Edmonds Community College.

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