Lab 2 - Ryan O'Hearn Chemical Principles II Lab -...

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Ryan O’Hearn Chemical Principles II Lab - 1011.206.43 Acid-Base Titrations 22:43:53 Purpose Learn how to do acid-base titrations in order to find the concentration of acid in an unknown liquid. In this process learn how to properly do an acid-base titration with an indicator. Procedure See “Chemistry 206 Lab: Chemical Principles II Laboratory,” Lab #2: “Acid-Base Titrations.” With the exception of Part IV, because due to a lack of enough unknown solution, we were only able to complete four trials instead of five. Data Tables, Graphs Part III: Standardization of NaOH Titrant Trial Mass KHP Moles KHP mL NaOH Final mL NaOH Initial Ml NaOH Used M NaOH A 0.640 .0090 14.25 0.0 14.25 0.632 B 0.602 .0084 27.6 14.25 13.35 0.629 C 0.613 .0086 41.4 27.6 13.80 0.623 D 0.624 .0088 16.8 3.0 13.80 0.638 E 0.611 .0086 30.35 16.8 13.55 0.635 Average M NaOH = 0.6314 Part IV: Determination of Unknown Acid Molarity Unknown = 28 Trial mL NaOH Final mL NaOH Initial mL NaOH Used M Unknown Acid A 41.5 30.35 11.15 0.704 B 1.15 0.0 11.15 0.704 C 22.1 11.15 10.95 0.691 D 33.4 22.1 11.3 0.713 Average M Unknown = 0.703 Sample Calculations Average Molarity = ∑ Molarities ÷ Total # of Trials Average M NaOH = (0.632+0.629+0.623+0.638+0.635) ÷ 5 = 0.6314 1
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Moles KHP = Grams KHP ÷ Molar Mass KHP
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This lab report was uploaded on 04/17/2008 for the course CHEMISTRY Gen and An taught by Professor Thomaskim during the Spring '08 term at RIT.

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Lab 2 - Ryan O'Hearn Chemical Principles II Lab -...

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