John Butler Antacid Lab

John Butler Antacid Lab DATA TABLE I: Back Titration of HCl (aq) NOT Neutralized by Antacid Tablet Molarity of HCl: 1.00 Molarity of NaOH: 1.00 Antacid assigned to your group: Gaviscon Cost per tablet: 11 c Active agent in antacid: Aluminum hydroxide and magnesium carbonate Trial # Mass of Antacid Volume of HCl added to antacid Initial Buret Reading Final Buret Reading Volume of NaOH used 1 1.607g 25 mL 38 mL 16.5 mL 21.50 mL 2 1.60 25 mL 20 mL 12mL 18.00 mL 3 1.61 25 mL 30.5 9.5 mL 21.00 mL Average volume of NaOH (aq) used 20.20 mL

DATA TABLE II: Comparison of Commercial Antacids Antacid 1: AlkaSeltzer Antacid 2: Tums Antacid 3: Gaviscon Antacid 1 Antacid 2 Antacid 3 Average volume of NaOH (aq) used ( from Data Table I ) 19.28 mL 7.29 mL 20.20 mL Mols of. NaOH (aq) .01298 .00729 .02020 Mols of HCl (aq) not neutralized by antacid .01928 .00729 .02020 Mols of HCl (aq) neutralized by antacid .00572 .01771 .00480 Volume of stomach acid that would be neutralized by antacid (mL) 36.9 mL 11.43 mL 31.0 mL Cost of Antacid tablet (¢) 17 c 10 c 11 c Cost per mL of stomach acid .46 c .87 c .35 c Calculations: L x Molarity =moles M x V - M1 x V1= moles neutralized by antacid .025 moles - .02020 moles = .00480 moles neutralized by antacid (.00480 moles of HCl)/(.155M)= 31.0 mL 1. .0202 moles of NaOH 2. .0202 moles of HCl 3. .00480 moles of HCl were neutralized by antacid 4. 31.0 mL of stomach acid would be neutralized 5. .35 c/L Conclusion: 6. According to my data I would want to buy Gaviscon because it is only .35 c per mL of