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Unformatted text preview: Page 1 Name: Section: ID Number: Lab Partner Total Points = 60 pts: 55 for report + 5 for notebook pages Notebook Pages (5 pts): Your notebook pages will be graded for general organization and completeness (Can your TA easily find and read the data he/she is looking for?) Did you plot your data during lab? PURPOSE AND METHOD DATA, CALCULATIONS AND GRAPHS A: Standardization of NaOH using KHP Table 1: Data for Calculation of [NaOH] Run #1, 1 pt Run #2, 1 pt Run #3, 1 pt** Mass of KHP 0.406 g Mass of KHP 0.404 g Mass of KHP g Molar Mass, KHP 204.22 g/mole Molar Mass, KHP 204.22 g/mole Molar Mass, KHP g/mole Initial buret reading 0.35 mL Initial buret reading 20.70 mL Initial buret reading mL Final buret reading 20.70 mL Final buret reading 41.10 mL Final buret reading mL mL Titrated 20.35 mL mL Titrated 20.40 mL mL Titrated mL L Titrated 0.02 L L Titrated 0.02 L L Titrated L [NaOH] 0.0977 M [NaOH] 0.0970 M [NaOH] M Average [NaOH 0.0974 M ([NaOH] will autofill in Line 223 for use in Ka calculation) EXP 1: ACID-BASE TITRATION Do not do calculations on your calculator and enter values here. Use Excel for all your calculations. If you need help with learning how to use Excel, consult the "How-to Guides" available via links on the website for this experiment. This section has been completed for you as an example. There is no need for you to redo this section. However, do NOT copy this into your lab notebook for your required Purpose & Procedure section - use this as a guide of what to include and write something in your own words. The purpose of this lab is to determine the concentration and dissociation constant of an acetic acid (HOAc) solution. The acid solution will be titrated with ~0.10 M sodium hydroxide while a pH meter is used to monitor the change in pH after each addition of base. The resulting titration curve (plot of pH versus volume of NaOH added) will be used to determine the equivalence point of the titration. Using the data from the titration curve, a derivative plot will be generated, the maximum of which identifies the volume of base added to reach the equivalence point. The volume of base added at the equivalence point, together with the concentration of the base and the volume of acid titrated, will be used to calculate the molarity of the acid according to the following equations: HOAc + NaOH → OAc- + H2O + Na+ Macid*Vacid = Mbase*Vbase There are two parts to this lab: (A) Standardization of the NaOH(aq) using potassium hydrogen phthalate (KHP). A known mass of KHP is titrated with NaOH(aq) to a phenolphthalein indicator endpoint. From the moles of KHP and the known stoichiometry of the reaction (1:1), the concentration of NaOH is calculated....
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This note was uploaded on 10/26/2010 for the course CHEM 152 taught by Professor Chiu during the Fall '08 term at University of Washington.
- Fall '08