Experiment 7

Experiment 7 - March 27 EXAM I Science Center NASA...

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Recitation 1 March 27 EXAM I – Science Center NASA AUDITORIUM 12-12:50 (Recitation) 1. Molecular Geometries of Covalent Molecules: Lewis Structures & VSEPR Theory 2. Vapor Pressure of Water 3. Spectrophotometric Analysis of Commercial Aspirin 5. Rates of Reaction: A Clock Reaction
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Recitation 2 ACID-BASE TITRATIONS Neutralization reactions: H 3 O + + OH - 2 H 2 O hydronium hydroxide H + + OH - H 2 O You will be given a solution of NaOH that is approximately 0.1 M. Skip the first paragraph under Procedure. Part A. Standardization of the NaOH solution . Determine accurately the molarity of that solution. Use 0.4 to 0.6 g of potassium hydrogen phthalate (KHP) measured exactly to 3 decimal places. Prepare 3 samples. Use boiled distilled water, so that it contains no CO 2 . CO 2 reacts with water to form H 2 CO 3 , which is an acid.
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Recitation 3 C C O OH O O K + + NaOH C C O O O O K + Na + + H 2 O KHP + NaOH KNaP + H 2 O 1 to 1 reaction pH mL NaOH initial pH, before any NaOH is added inflexion point or equivalence point : all acid has been neutralized almost pH of NaOH solution endpoint : pH range where indicator changes color phenolphthalein : around pH 9 changes color. Acid = colorless; basic = red
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Experiment 7 - March 27 EXAM I Science Center NASA...

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