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Data Table 3: Analysis of Milk of Magnesia Trial 1Trial 2 Mass of milk of magnesia 2.54 g 2.49 g Density of milk of magnesia 1.14 g/mL Volume of acetic acid, initial 10 mL 10 mL Volume of acetic acid, final 1.8 mL 2.0 mL Volume of acetic acid, total 8.2 mL 8.0 mL Concentration of acetic acid 0.88 M Moles of acetic acid 7.0 x 10^-3 moles 7.0 x 10^-3 moles Moles of Mg(OH)2 3.5 x 10^-3 moles 3.5 x 10^-3 moles Moles Mg(OH)2/ g milk of magnesia 1.4 x 10^-3 mol/g 1.4 x 10^-3 mol/g
4 ConclusionCompletely dissolving a tablet of Tums in Activity 2 took much longer than dissolving a tablet of Alka-Seltzer in Activity 1. Time requirements for Activity 2 was 30 minutes, but that was not enough to do the whole activity because of the waiting time to dissolve the tablet. Giving plenty of time to complete an experiment is necessary. In Activity 3, shaking a bottle of milk of magnesia would have been forgotten, and that would have caused completely different results. The bottle must be shaken well before use because the solid particles of magnesium hydroxide settle out of the undisturbed solution over time. Reference Carolina Distance Learning Investigation Manual, Evaluating the Efficacy of Antacids