Lab 4 report2

# Lab 4 report2 - NAME and ID Number Amie Marston Quiz...

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NAME and ID Number: Amie Marston LAB PARTNER: Chris Lyles Quiz Section: BV Total Points = 60 (5 notebook, 55 template) PURPOSE AND METHOD DATA AND CALCULATIONS A. Standardization of NaOH Run 1 Run 2 Run 3** Mass of KHP, g 0.13 0.13 moles KHP 0.00181 0.00184 Initial buret reading, mL 0 0 Final buret reading, mL 6.5 6.45 mL NaOH titrated 6.5 6.45 L NaOH titrated 0.01 0.01 [NaOH], moles/L 0.100 0.100 Average, [NaOH] 0.100 M 3 pts Table 1: NaOH Standardization How are the solubility products (K sp ) of KHP at various temperatures determined? ( 3 pts ) KHP <--> K+ + HP- L/moles = Molarity of HP- In our experiment we used 1ml KHP, so: 1ml KHP * 1L/1000ml = 0.001L / moles NaOH = M of HP- Ksp = [HP-] * [HP-] How is K sp in a saturated solution of KHP in 0.50 M KCl determined? (3 pts ) EXPERIMENT 4: THERMODYNAMICS II THE TEMPERATURE DEPENDENCE OF THE SOLUBILITY PRODUCT, HEAT OF SOLUTION, AND ENTROPY OF SOLUTION OF POTASSIUM HYDROGEN PHTHALATE Show the calculation for determining [NaOH]for one of the runs. May be typed or NEATLY handwritten. 0.0065L NaOH * 0.1M = 6.5E-4 moles NaOH 6.5E-4 moles / 0.0065L titrated = [.1] **If you only performed two titrations, show the calculation that you used to determine that you did not need to do a third titration. 100 - ((0.1/0.1)*100) = 0.00 so error rate is <3% By signing below, you certify that you have not falsified data, that you have not plagiarized any part of this lab report, and that all calculations and responses other than the reporting of raw data are your own independent work. Failure to sign this declaration will cost you 5 points. Signature:

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B. 1.00 mL DO NOT enter the data for the solution with KCl in this table Temperature, K mL NaOH added 1/T(K) Ln(Ksp) 1.3 274.3 0.00 1.00 1.00 0.100 10.000 100.0000 0.00365 4.605 20.7 293.7 0.00 4.3 4.30 0.430 2.326 5.4083 0.00340 1.688 20.8 293.8 0.00 4.25 4.25 0.425 2.353 5.5363 0.00340 1.711 20.8 293.8 0.00 4.30 4.30 0.430 2.326 5.4083 0.00340 1.688 33.2 306.2 0.00 5.40 5.40 0.540 1.852 3.4294 0.00327 1.232 43.3 316.3 0.00 6.55 6.55 0.655 1.527 2.3309 0.00316 0.846 51.2 324.2 0.00 8.45 8.45 0.845 1.183 1.4005 0.00308 0.337 60.7 333.7 0.00 11.45 11.45 1.145 0.873 0.7628 0.00300 -0.271 3 pts slope 6507.6000 K y-intercept -19.97 R 0.945 54104.2 -166.0 K sp without KCl, Titrations of KHP Samples
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