Lab Report 3 - Weak Acid Titration

Lab Report 3 - Weak Acid Titration - Weak Acid Titration...

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Weak Acid Titration Abstract: The reaction between Allura Red dye and bleach was evaluated in multiple trials to determine the overall rate law for this reaction. The first two trials held the bleach constant (in excess of 1000 times the moles present of dye) while reacting with first a 1:95 dilution of dye and then a 1:100 dilution of dye, in order to determine the rate law order in regards to dye. The dye was found to be 1 st order in the rate law based on the linear graph of ln[dye] vs. time. The last three trials held the dye constant at a 1:95 dilution while the concentration of bleach was varied using dilutions of 1:9, 1:10, and 1:11. The rate law order in regards to bleach was found to be zero from a comparison of the very close rates in all three trials. After calculating k, the general rate law for this reaction was found to be Rate=-.074[dye]. Introduction The main objective of this experiment was to determine an unknown weak acid using a titration curve. The secondary objectives were to “prepare a sodium hydroxide solution and standardize it against potassium hydrogen phthalate, accurately weigh both solid and
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liquid samples, make simultaneous volume and pH measurements, determine moles of a weak acid from a weak acid titration, determine K a values from weak acid titration data, measure a sample of an unknown weak acid and titrate it with the NaOH solution until the solution is distinctly basic, determine the molecular weight of the weak acid from the titration data, identify an unknown weak acid from experimentally determined molecular
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This note was uploaded on 09/09/2008 for the course CHEM 104B taught by Professor Staff during the Spring '07 term at University of Arizona- Tucson.

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Lab Report 3 - Weak Acid Titration - Weak Acid Titration...

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