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Unformatted text preview: Exp 10: Acid – Base Titrations Goals: 1) To learn the popular technique of titration. 2) To practice calculations involving concentration and stoichiometry. 3) To determine the concentration of acetic acid in vinegar. Experiment: Titration is an experimental analysis technique that allows determination of the concentration of an unknown solution (i.e.: an acid in this lab). Since Molarity is the number of moles of solute per Liter of solution, then measuring the volume of acid solution directly, and then calculating the number of moles present via titration, the concentration in Molarity (and Normality if necessary) can be determined. Molarity of acid = moles of acid = mol volume of acid L During a titration, a measured volume of acid is reacted with a base (commonly NaOH) of a precisely determined concentration (called a standard solution ). The concentration of the base times its volume gives moles of base, which can be related stoichiometrically to moles of acid via the balanced neutralization equation. moles base = Molarity base x Volume base = M x V A buret is used to precisely measure the volume of base reacted with the acid. A buret is essentially an inverted is used to precisely measure the volume of base reacted with the acid....
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- Fall '08
- Chemistry, Carboxylic acid, th e acid, concen tration