ࡱ> 02/#` bjbj .>+ w"""6^-^-^-8-T-T6ZJ.`.`.`.`.s/s/s/ZZZZZZZ$L\h^CZ"s/o/s/s/s/CZ`.`.XZ111s/j8`."`.Z1s/Z11nS "V`.>. `wy)K^-/T QWnZ0ZU:__0 :_@VV:_")V(s/s/1s/s/s/s/s/CZCZk1js/s/s/Zs/s/s/s/666D666666 Name ______________________________________ Before you begin, save this Lab Report Template on your computer as LastNameAPChem3 Title: Molar Mass Purpose: To determine the molar mass of a compound Materials: 0.1 M potassium hydroxide, KOH potassium hydrogen phthalate (KHP), KHC8H4O4 phenolphthalein test paper distilled water15 mL beaker 150 mL beaker graduated pipet 1.0 mL measuring spoon 10.0 mL graduated cylinder Procedure: Calibrate a dropping bottle Use a dropping bottle containing distilled water Count number of drops to reach 1.0 mL in the graduated cylinder (Note: Hold bottle vertically to maintain drop size consistency) Repeat 4 times and find average # of drops/ 1.0 mL Record in Data Table 1 below Place 1.0 mL KHP into 150 mL beaker (Note: 1.0 mL KHP = 1.02 g KHP) Add 8090 mL distilled water to beaker and stir with pipet Add 1020 mL distilled water to beaker so volume is approximately 100 mL and stir Place 2.0 mL of KHP solution into 15 mL beaker, using the graduated pipet Drop about 5 mm phenolphthalein test paper into the 15 mL beaker Titrate the KHP solution using 0.1 M NaOH Hold dropper bottle of NaOH vertically above the small beaker containing 2 mL KHP Count drops of NaOH to produce a pink color that remains Record the number of drops in Data Table 1 Rinse 15 mL beaker at least 3 times with distilled water Repeat titration of 2.0 mL KHP solution 4 times Determine average number of drops to end point (pink color remains) Calculate the molar mass of KHP (see calculations, below) Results: Data Table 1: Calibration and Titration DataTrial (12345AverageDrops H2O/mLDrops KOH to end pointAVolume KOH (mL)BMass KHP/L (g/L)Volume KHP2.0 mL2.0 mL2.0 mL2.0 mL2.0 mL2.0 mLCMolarity KHP (mol/L)DMolar Mass KHPEPercent ErrorCalculations: Show one set of calculations for molarity, one for molar mass, and one for percent error. The rest you may do on your calculator and record in Data Table 1, above Volume KOH: # drops KOH x average # drops H2O/mL Mass KHP/L (g/L): 1.02 g KHP/100 mL x 103 mL/L (This will be the same for all trials!) Molarity KHP (mol/L): M1V1 = M2V2 M1 = molarity KOH (0.1 M) V1 = volume KOH titrated (A) M2 = ?? m/L KHP V2 = 2.0 mL KHP M2 = M1V1/V2 Molar Mass KHP: Mass KHP/Molarity KHP (or B / C) Percent Error:  EMBED Equation.DSMT4  A = 204.2 g/mol, and O is your calculated value from step D Discussion: Summarize what you did and describe your results making specific reference to your data. All your statements must be supported by evidence from the lab. Indicate sources of error. Suggest improvements in the experimental design. 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