Lab Report #1.docx - 1 DETERMINATION OF THE DISSOCIATION...

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1DETERMINATION OF THE DISSOCIATION CONSTANT OF A WEAK ACID1Determination of the Dissociation Constant of a Weak AcidMarch 12, 2020D L. FPartners: S FCHEM 1012-2L1
2DETERMINATION OF THE DISSOCIATION CONSTANT OF A WEAK ACID1ObjectiveTo become familiar with the use/operation of a pH meter and determine the magnitude of theequilibrium constant of a weak acid.Background InformationThe Bronsted-Lowry acid-base theory states the strength of an acid is based on its donatedprotons. Acid-base reactions then compete between different bases of various strengths for thedonated protons. When dealing with strong acids they dissociate completely becoming aqueoussolutions. On the other hand, acetic solutions, weak acids, dissociate slightly. Partial acetic acidwill remain in the solution after dissociation. When titrating weak acid HA with a base there isnumbers of moles of base added, which is half of the moles of the initial acid. While titratingweak acid with a strong base you can determine the ionization constant of the weak acid byrecording the pH versus the volume of the base added. The pH meter consists of a meter withelectrode assembly. The purpose of the instrument is to measure pH solutions via the twoelectrodes it contains.Material & ChemicalsApparatus:Paper & PencilpH Meter with electrodesBalance150 mL beakers (4)Buret1 pt plastic bottle with plastic lidBunsen Burner & hoseWire gauze600 mL Erlenmeyer flask250 mL Erlenmeyer flask (3)
3DETERMINATION OF THE DISSOCIATION CONSTANT OF A WEAK ACID125 mL pipet & pipet bulbBuret clamp & ring standWeighting bottleRing stand & ringWash bottleChemicals:Potassium hydrogen phthalate (KHP)Standard buffer solutionUnknown Solution of a weak acid0.1 M NaOH or 19 M NaOHPhenolphthalein indicator solutionBuffer solution OH=4.0ProcedureA.Preparation of Approximately 0.100 M Sodium Hydroxide (NaOH)1.SAFETY HAZARD: Put on safety goggles and gloves before even touching anychemicals or material.

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Term
Spring
Professor
EugenioJaramillo
Tags
pH, KHP

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