Determination of the Ionization Constant of a Weak Acid with Titration Lab.docx

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Determination of the Ionization Constant of a Weak Acid with TitrationIntroduction:Titration, or volumetric analysis, originated in the late 1700s in France. François-Antoine-Henri Descroizilles developed the first burette in 1791. Joseph Luis Guy-Lussac first used the wordtitreas averb in 1828 to “determine the concentration of a substance in a given sample.” So, today the purpose oftitrations is to determine an unknown concentration in a sample by adding a titrant to the unknown with anindicator. When the indicator changes color, or, with acid/base titrations, the pH dramatically increases wehave crossed the equivalence point. Once we reach the equivalence point we know the titrant has reactedwith all the available unknown solution and we can then calculate the concentration of the unknownsubstance. The purpose of this experiment is to use a known concentration of base to find the concentration ofa weak acid using a titration curve.Equipment/Chemicals:pH meterBuretteRing stand and burette clampMagnetic stirrer and stir bar150 mL beaker100 mL beaker100 mL graduated cylinder0.1M Sodium Hydroxide – NaOHUnknown concentration of Acetic acid solutionProcedure:First we set up a ring stand with burette clamps with a burette secured and place the magneticstirrer under the tip of the burette. Rinse the burette with distilled water and run small amounts of SodiumHydroxide through the burette before filling with the base solution. Fill the burette with 50 mL of the SodiumHydroxide solution. It is good practice to have a 100 mL beaker with extra Sodium Hydroxide to ensure that theburette does not run out of the base solution. Be sure that there is base solution in the tip below the stopcockin the burette before you begin your titration. Then take a clean, dry 150 mL beaker and place under theburette tip. Carefully measure 25.0 mL of the unknown Acetic acid solution into a graduated cylinder and pour

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Term
Fall
Professor
Staff
Tags
pH, Sodium hydroxide, burette

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