Chem152_Titration2_Report

Chem152_Titration2_Report - Name and ID Number: Sharon Lee...

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Page 1 Name and ID Number: Sharon Lee 08606820 Section: CHEM 152 CE Lab Partner: Andy Richards Total Points = 60 pts, notebook plus template Notebook Pages (5 pts): your notebook pages will be graded for organization and completeness (Can your TA easily find and read the data he/she is looking for? Did you plot your data?) 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 p Mass of KHP 0.430g Mass of KHP 0.420 g Mass of KHP Molar Mass, KHP 204.22g/mole Molar Mass, KHP 204.22 g/mole Molar Mass, KHP Initial buret reading 0mL Initial buret reading 0 mL Initial buret reading Final buret reading 21mL Final buret reading 20.8 mL Final buret reading mL Titrated 21mL mL Titrated 20.8 mL mL Titrated L Titrated 0.02L L Titrated 0.02 L L Titrated [NaOH] 0.1005 M [NaOH] 0.0990 M [NaOH] Average [NaOH] 9.98E-02 M ([NaOH] will autofill in Line 240 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. This section has been completed for you as an example. There is no need for you to redo this section. 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 - + H 2 O + Na + M acid *V acid = M base *V base 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. (B) Titration of acetic acid, (HOAc) with NaOH(aq). The pH of the HOAc is measured as a function of volume of NaOH added. A plot of pH versus volume of NaOH added and a plot of derivative (slope between adjacent points) versus volume of NaOH are used to determine the equivalence point. The equivalence point is used to calculate the concentration of HOAc and the pH of the mixture prior to
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Chem152_Titration2_Report - Name and ID Number: Sharon Lee...

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