Copy of Chem152_Thermo2_Report_092611

Copy of Chem152_Thermo2_Report_092611 - Name: Michel e Bang...

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Unformatted text preview: Name: Michel e Bang Quiz Section: AG ID Number: 1021913 Lab Partner: Tessa Barclay T otal Points = 60 (5 notebook, 55 tem plate) PURPOSE AND METHOD DATA AND CALCULATIONS A. Flame emission determination of [K+] in the 0.50 M KCl + KHP (sat) solution Preparation of Standards DAT A 50 m L of each standard solution (from prelab) Solution Intensity Standard [K +], (M ) m L of stock Standard 1 0.000075 86 1 7.50 E-5 0.75 Standard 2 0.00015 157 2 1.50 E-4 1.50 Standard 3 0.000225 233 3 2.25 E-4 2.25 Standard 4 0.0003 308 4 3.00 E-4 3.00 Standard 5 0.000375 375 5 3.75 E-4 3.75 Intensity 24.4 345 3 pts slope 972000 y-intercept 13.1 Dilution factor 24.4 3.414E-04 2,500 0.010 3 pts B. Standardization of NaOH Run 1 Run 2 Run 3* Mass of KHP, g 0.129 0.13 0.13 moles KHP 0.00063 0.00064 0.00064 Initial buret reading, mL 0.03 0.01 Final buret reading, mL 6.24 6.70 6.23 mL NaOH titrated 6.21 6.69 6.23 L NaOH titrated 0.00621 0.00669 0.00623 [NaOH], moles/L 0.101 0.096 0.103 Average, [NaOH] 0.099 M 3 pts C. Titrations of KHP Samples with and without KCl m L of K H P(aq) used in titrations 1.00 m L DO NOT enter the data for the solution with KCl in this table Temperature, K 1/T (in K) 0.0 273.15 0.05 2.45 2.40 0.240 0.240 0.0576 0.00366-2.854 24.4 297.55 0.05 4.70 4.65 0.465 0.465 0.216 0.00336-1.532 36.6 309.75 0.01 7.48 7.47 0.747 0.747 0.558 0.00323-0.583 44.4 317.55 0.00 8.97 8.97 0.897 0.897 0.805 0.00315-0.217 57.4 330.55 0.03 11.94 11.91 1.190 1.190 1.416 0.00303 0.348 65.4 338.55 0.05 13.49 13.44 1.343 1.343 1.804 0.00295 0.590 3 pts slope-5036 K R 8.315 y-intercept 15.553 41.87 kJ/m ol 129.315 J/m ol 24.4 0.05 4.70 4.65 0.465 0.465 autofil s from Table 5 24.4 0.025 4.67 4.645 0.464 0.464 24.4 0.025 4.40 4.375 0.437 0.437 Average M 0.455 m L of K H P(aq) used in titrations 1.00 m L 2 pts 0.207 (from T able 5 and two m ore replicates) 24.4 0.00 7.57 7.57 0.757 0.252 24.4 0.00 7.77 7.77 0.777 0.259 24.4 0.01 7.95 7.94 0.794 0.265 Average M : 0.259 m L of K H P(aq) in K Cl used in titrations 3.00 m L 2 pts 0.221 4 pts RESULTS AND DISCUSSION 2 pts 2. Based on your results at room tem perature, what is the solubility of KHP in g/L 3 pts 4 pts 4 pts 3 pts How do your results com pare (calculate and com m ent on % dif erence)? 2 pts Table 1 : Volum e of 5.00x10- 3 M needed to m ake Table 2 : Flam e Photom eter Data [K + ], (M ) Temperature, o C KH P(sat) in 0.50 M KC l M- 1 Table 3 : Flam e Em ission D eterm ination of [K + ] in the original sam ple Temperature, o C [K + ] in M easured Solution (M ) [K + ] in Original S olution (M ) Table 4: NaOH Standardization Table 5: Titration Data and Calculations...
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