Post lab 3.docx - CHM 3120C June 28th 2021 Post-Lab 3...

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CHM 3120C June 28 th , 2021 Post-Lab 3: Practice Titration, Potassium Hydrogen Phthalate (KHP) I. Quantitative Observations Trial 1 Trial 2 Trial 3 Mass of a weighing paper (or dish) 0.2321g 0.2364g 0.2367g Mass of a weighing paper (or dish) and dried KHP 0.9312g 0.9377g 0.9318g Mass of dried KHP 0.6991g 0.7013g 0.6951g # of moles, KHP 0.00342 mol 0.00343 mol 0.00340 mol Volume of NaOH (Initial buret reading) 0.5mL 0.1mL 1.1mL Volume of NaOH (Final buret reading) 33.75mL 33.6mL 34.4mL Volume of NaOH used 33.25mL 33.5mL 33.3mL Molarity of the NaOH solution 0.1029 M 0.1024 M 0.1021 M % Error Average Molarity of NaOH solution and STD: 0.1025 ± 0.0004 Calculations:
II. Research Questions 1) What is the correct way to handle a burette and an Erlenmeyer flask during titration? The burette stopcock must be adjusted to be letting the solution out dropwise really slowly once the endpoint approaches. The Erlenmeyer flask must be constantly swirled around for the solution to be thoroughly mixed at all times. One hand should be at the burette controlling the drops falling in the Erlenmeyer flask while the other hand should be swirling the flask gently. 2) Provide at least 2 different examples of desiccant material and at least 2 different styles of desiccator and explain how they function differently. Desiccant- 1. Silica Gel is the common name for silicon dioxide (SiO2), which is a naturally occurring mineral that is made into beads and granules. This product has the ability of pulling

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