93%(156)145 out of 156 people found this document helpful
This preview shows page 3 - 6 out of 7 pages.
the NaOH. Then start adding 1 M NaOH dropwise from the syringe, with constant swirling, untila single drop of NaOH causes the solution to change to a yellow colour that persists for a few seconds after the addition, this is the equivalence point, and the end of the titration has been reached. Record the final volume of NaOH in the syringe in the table. Place the cup against the sheet of white paper and take a photograph of the final colour of the solution. Calculate the total volume of NaOH added to the solution in the table. Dispose of the solution in the cup. Thoroughly rinse the plastic cup with room temperature tap water at least 5 times. Dry the cup completely before proceeding.Repeat this whole process, but with the second tablet of Alka-Seltzer. Before proceeding to Activity 2, dispose of the solution in the large plastic cup, rinse the cup at least 5 times with room-temperature tap water, and dry the cup completely.Data/ResultsData Table 1Trial 1Trial 2Mass of acetic acid 5.0 g5.1 gDensity of acetic acid 1.00 g/mLConcentration of acetic acid0.88 MMass of Alka-Seltzer 3.1 g3.0 gVolume of NaOH, initial 5.0 ml 5.0 mlVolume of NaOH, final 3.0 ml2.8 mlVolume of NaOH, total 2.0 ml2.2 mlMoles of acetic acid 0.0830.085Moles of NaOH 0.0020.002Moles of NaHCO3 0.0360.036Moles NaHCO3/ g Alka-Seltzer 0.012 0.0123
Bogen’s Universal IndicatorBogen’s Universal Indicator + Alka-Seltzer TabletActivity 2 (Analysis of Tums) MethodUsing the exact same method as activity 1, but instead of the Alka-Seltzer tablet, use the Tums tablet. Data/ResultsData Table 2Trial 1Trial 2Mass of acetic acid 5.0 g4.9 gDensity of acetic acid 1.00 g/mLConcentration of acetic acid0.88 MMass of Tums 1.8 g2.0 gVolume of NaOH, initial 5.3 ml4.8 mlVolume of NaOH, final 3.1 ml2.7 mlVolume of NaOH, total 2.2 ml2.1 mlMoles of acetic acid 0.0830.082Moles of NaOH 0.0020.002Moles of CaCO30.0180.020Moles CaCO3/ g Tums 0.0230.0104
Bogen’s Universal Indicator + Tums TabletActivity 3 (Analysis of Milk of Magnesia)MethodRinse the 5 mL syringe thoroughly with tap water. Draw water into the syringe and expel the water at least 5 times. Then, place the large plastic cup on the weigh balance and tare the balance. Weigh 2.5 g of milk of magnesia into the cup and record the exact mass in Data Table 3.