CHEM 104 Experiment 3 Titrations and titration curves-100% tutor verified-2024-2025, Exams of Chemistry

Download CHEM 104 Experiment 3 Titrations and titration curves-100% tutor verified-2024-2025 and more Exams Chemistry in PDF only on Docsity! 1 Chemistry Notebook CHEM 104 Experiment 3 Titrations and titration curves-100% tutor verified-2024-2025 Name: Date: Experiment #: 3 Title: Titrations and titration curves Purpose: The purpose of this to perform titration analyses, including neutralization titrations, which occur between an acid and a base. Procedure: After gathering the necessary supplies, it was decided that we would perform reactions between the following solutions: strong acid/strong base, weak acid/strong base and strong acid/weak base. Standardization titration of NaOH: Used a strong acid/weak base. We determine the molarity of the NaOH by titrating it against potassium hydrogen phthalate. The phenolphthalein indicator was added to the solution of NaOH in a beaker along with water. We expect the solution to change from colorless to pink. We then documented the total amount of NaOH added from the buret to establish the color change. KHC8H4O4 + NaOH  NaKC8H4O4 + H2O Standardization titration of HCl: Used a strong acid/strong base. The starting color of the solution is a translucent light yellow. The indicator utilized in this experiment is bromothymol blue, which was added to a solution of HCl. The given molarity of NaOH is 0.130M. Our goal endpoint pH was ~7.0. The goal color change is yellow to blue. HCl + NaOH  NaCl + H2O Standardization titration of vinegar: Used weak acid/strong base. For this experiment, we utilized weak acid vinegar & strong base NaOH. After obtaining 3.09 g of vinegar, we added the NaOH indicator via the buret until a pink color change was obtained. A total of 19.7 mL of NaOH was added. HC2H3O2 + NaOH  NaC2H3O2 + H2O Standardization titration of ammonia: After obtaining a graduated cylinder, scale, & household ammonia, a beaker was placed on a scale & zeroed. Ammonia drops were then added to a total of 2.0693 g. Methyl orange indicator (orange in color means neutral or more leaning towards neutral) added to the ammonia solution (which is a base). The goal is to change the color from yellow back to orange. NH3 + HCl  NH4 + Cl Standardization titration of antacid tablets: After obtaining a generic brand of antacid tablets 2 Chemistry Notebook (base), we selected a few yellow-colored tablets & crushed them using a mortar & pestle. HCl was added to the base & we then planned on back-titrating. Next, we added 25.0 mL of 0.106 M