# DoeIonizationConstantOfAWeakAcidLab.docx - 1 Lab 4...

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Lab 4: Ionization Constant of a Weak Acid, KaData SheetVolume NaOH (mL)pH (Trial A)0.002.745.003.4610.003.9315.004.2620.004.5825.004.9026.004.9827.005.0728.005.1729.005.2729.505.3330.005.4030.505.4631.005.5432.005.7233.006.0834.006.7935.0010.5740.0011.7045.0011.9650.0012.12Excel DataVol. NaOH(mL)pHVol. NaOH(mL)1stderivative02.7453.462.50.144103.937.50.094154.2612.50.066204.5817.50.064254.922.50.064264.9825.50.08275.0726.50.09285.1727.50.1295.2728.50.11
29.55.3329.250.12305.429.750.1430.55.4630.250.12315.5430.750.16325.7231.50.18336.0832.50.36346.7933.50.713510.5734.53.784011.737.50.2264511.9642.50.0525012.1247.50.032Excel Plots2
0102030405060012345678910111213Titration Plot: Data Set 1Vol. NaOH (mL)pH051015202500.511.522.533.54First Derivative Plot: Data Set 1delta Vol. NaOH (mL)delta pH/delta Vol. NaOHLaboratory Report Sheet3
Trial AVol. NaOH to reach equivalence point (mL):34.5Vol. NaOH to reach half-equivalence point (mL):17.5pH at half-equivalence point (pKa):4.5Ka:3.16 x 10-5pKato KaCalculationKa=10-pKaKa=10-4.5Ka=3.16 x 10-5Lab Experiment Writing Assignment4
The following written report is presented by student, Erika Bowring for the lab experiment titled “Ionization Constant of a Weak Acid.” This lab was conducted under the guidance of Professor Mark Schnittman using the manual utilized by Farmingdale State College, CHM 153 Laboratory Manual for General Chemistry Principles II.The Bronsted-Lowry Theory for acids and bases was explored while conducting this laboratory experiment. This theory states that any species (molecule or ion) that can donate a proton to another species is an acid, and any species (molecule or ion) that can accept a proton is a base. When referring to acids and bases, they can be called strong or