CHM 101L M3 Evaluate Antacids Lab Report

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Southern New Hampshire University *

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Chemistry

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Feb 20, 2024

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Evaluating the Efficacy of Antacids Student Name Paul S. Nomsule Date 01/28/2024
1 Data Data Table 1 Trial 1 Trial 2 Mass of acetic acid 5.23 g 5.01 g Density of acetic acid 1.00 g/mL 1.00 g/mL Concentration of acetic acid 0.88 M 0.88 M Mass of Alka-Seltzer 3.25 g 3.27 g Volume of NaOH, initial 5.0 ml 5.0 ml Volume of NaOH, final 5.0ml 5.0 ml Volume of NaOH, total 0 ml 0 ml Moles of acetic acid 0.0046 M acetic acid 0.0044 M Acetic acid Moles of NaOH 0 M NaOH 0 M NaOH Moles of NaHCO 3 0.0046 M NaHCO3 0.0044M NaHCO3 Moles NaHCO 3 / g Alka-Seltzer 0.0014 M NaHCO3/g Alka-Seltzer 0.0013 M NaHCO3/g Alka-Seltzer 1. Why is it important to record the initial and final volume each time the syringe is refilled? In order to obtain the accurate total volume, it is important to record the initial and the final data. Accuracy is an essential element of science and validity of experiemental result. Data Table 2 Trial 1 Trial 2 Mass of acetic acid 5.06 g 5.05 Density of acetic acid 1.00 g/mL 1.00 g/mL Concentration of acetic acid 0.88 M 0.88 M Mass of Tums 1.32 g 1.30g Volume of NaOH, initial 5 ml 5mL Volume of NaOH, final 3.6ml 3.8mL © 2016 Carolina Biological Supply Company
2 Trial 1 Trial 2 Volume of NaOH, total 1.4 ml 1.2 mL Moles of acetic acid 0.0045 M acetic acid 0.0044 M acetic acid Moles of NaOH 0.0014 M NaOH 0.0012 M NaOH Moles of CaCO 3 0.0031 M CaCO3 0.0032 M CaCO3 Moles CaCO 3 / g Tums 0.0023 CaCO3/ g tums 0.0035 M CaCO3/ g Tums © 2016 Carolina Biological Supply Company
3 Data Table 3 Trial 1 Trial 2 Mass of milk of magnesia 2.54 g 2.53 g Density of milk of magnesia 1.14 g/mL 1.14 g/mL Volume of acetic acid, initial 10 mL 10 mL Volume of acetic acid, final 2.4 mL 3.2mL Volume of acetic acid, total 7.6 mL 6.8mL Concentration of acetic acid 0.88 M 0.88 M Moles of acetic acid 0.0067 M acetic acid 0.0068 M acetic acid Moles of Mg(OH) 2 0.044 M Mg(OH)2 0.043 M Mg(OH)2 Moles Mg(OH) 2 / g milk of magnesia 0.017 M Mg(OH)2/g 0.017 M Mg(OH)2/g 2. Which antacid is the most effective (has the highest number of moles of active ingredient) per gram of antacid? Which antacid is the most effective based on the manufacturer’s recommended dosage? Tums has proven to be the best anti-acid going by the result. It is important to stress that CaCO3 behaves as 2 mole per mole, which is a weak acid base. While the environment is clearly acidic, the weak acid acts as a buffer. In the process, it decreases the Ph of the stomach by absorbing more acid. 3. Milk of magnesia is generally not used as an antacid, even though it has strong antacid properties. Why might this be the case? Milk of magnesia is an alkaline substance. It is not an anti-acid because it has high base dosage. This might upset the Ph balance, therefore affecting proper digestion. 4. Why do you think the milk of magnesia takes longer to stabilize the pH during the titration than Alka-Seltzer or Tums? Milk Magnesia is a strong base. It may take it longer to balance the Ph; thus, it takes more time to stabilize the Ph. Tums and Alka-Seltzer are both acidic, therefore they can buffer the Ph of food in an acidic environment. © 2016 Carolina Biological Supply Company
4 Photos Cups should be placed against a sheet of white paper so the color of the solution is clearly visible. Photo 1 Insert the photo from Activity 1A, step 5. Photo 2 Insert the photo from Activity 1A, step 9. © 2016 Carolina Biological Supply Company
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