06Post - ? QUESTIONS ? With what accuracy and precision can...

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1 Strength of Vinegar by Acid-Base Titration Final Exercise – 105 points Last Update: 10/10/2007 11:46 AM ? QUESTIONS ? With what accuracy and precision can you determine the concentration of a solution of sodium hydroxide? Using that NaOH solution, with what and can you determine the concentration of a solution of acetic acid by titration? Concepts: Strong/Weak Acids Acid Dissociation/K a Concentration End point / Equivalence point Titration curves Logarithms Indicator Mole Relationships Titration Techniques: pH Measurement Apparatus: Burets pH Meter Primary Standard Weighing by Difference Preparing precise solutions Standardization Volumetric Flask Analytical Balance Pipet potassium hydrogen phthalate (KHP) Last exercise involved acid-base titration in which concentration of NaOH was given. In this exercise, you will STANDARDIZE the NaOH solution Standardization Analytical determination of the purity or concentration of a substance through reaction with a substance of verified composition and purity ( Primary Standard ) This STANDARDIZATION involves the reaction of NaOH with a PRIMARY STANDARD, the weak acid: O O H O O - K + KHP is a monoprotic weak acid. One available proton. [K + ]+ HC 8 H 4 O 4 - + OH - C 8 H 4 O 4 = + H 2 O + [K + ] The stoichiometry of the reaction is: Acetic acid, CH 3 COOH , is also a monoprotic weak acid. 1 mol KHP 1 mol NaOH 1 mol CH 3 COOH 1 mol NaOH STOICHIOMETRY CH 3 COOH + OH - CH 3 COO - + H 2 O It’s pK a is 4.7 It does not matter in which order you
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06Post - ? QUESTIONS ? With what accuracy and precision can...

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