Analysis of Antacid Tablets Lab
Analysis of Antacid Tablets Lab
Lab date: June 9, 2011
Introduction:
This lab is designed to provide the student with experience in understanding the principals of acid/base neutralization and to develop the laboratory skill of titration.
Procedure: 1. Gather materials: 0.20 M HCl solution, 0.20 M NaOH solution, 50 ml burette, bromophenol blue, 150 ml flask, electronic scale, tripod stand, motor and pestle, Bunsen burner, Tums tablet, Rolaid tablet, and Equate tablet. 2. Weigh antacid tablet as a whole on the electronic scale and record the data. 3. Break up the antacid tablet with the motor and pestle and weight it, ensure that it weighs between 0.80 and 1 gram and record the weight of the sample. 4. Add 50 ml of 0.20 M HCl solution to the flask. 5. Add antacid sample to flask. 6. Using the Bunsen burner, heat up the flask to just barley boiling and then stop heating. 7. Add 3 drops of bromophenol blue to the flask, color of solution inside flask should be yellow. If solution color is blue add 10 ml of 0.20 M HCl solution. 8. Fill burette to 0 ml with 0.20 M NaOH solution. 9. Place flask under burette and titrate with the 0.20 M NaOH solution until it turns blue. 10. Measure ml of NaOH used and record the data. 11. Calculate the ml acid used per gram of sample and per tablet, and then record the data. Repeat procedure for all tablets.
Chemical equations:
NaHCO3 + HCl → NaCl + H2O + CO2
Al(OH)3 + 3HCl → AlCl3 + 3H2O
Mg(OH)2 + 2HCl → MgCl2 + 2H2O
Ca(CO3) + 2HCl → CaCl + CO2 + H2O
NaAl(OH)CO3 + 2HCl → 2NaCl + 3H2O + 2CO2 + Al2O3
Data:
antacid tablets | Equate | Tums | Rolaid | Weight of tablet (g) | 1.21 g | 1.35 g | 1.70 g | Weight of sample (g) | 0.84 g | 0.87 g | 0.82 g | Total volume of HCl used (ml) | 60 ml | 50 ml | 50 ml | Final volume of NaOH used (ml) | 7 ml | 2.4 ml | 2 ml | Initial volume of NaOH used (ml) | 0 ml | 0 ml | 0 ml | Total volume of NaOH used (ml) | 7 ml | 2.4 ml
Lab date: June 9, 2011
Introduction:
This lab is designed to provide the student with experience in understanding the principals of acid/base neutralization and to develop the laboratory skill of titration.
Procedure: 1. Gather materials: 0.20 M HCl solution, 0.20 M NaOH solution, 50 ml burette, bromophenol blue, 150 ml flask, electronic scale, tripod stand, motor and pestle, Bunsen burner, Tums tablet, Rolaid tablet, and Equate tablet. 2. Weigh antacid tablet as a whole on the electronic scale and record the data. 3. Break up the antacid tablet with the motor and pestle and weight it, ensure that it weighs between 0.80 and 1 gram and record the weight of the sample. 4. Add 50 ml of 0.20 M HCl solution to the flask. 5. Add antacid sample to flask. 6. Using the Bunsen burner, heat up the flask to just barley boiling and then stop heating. 7. Add 3 drops of bromophenol blue to the flask, color of solution inside flask should be yellow. If solution color is blue add 10 ml of 0.20 M HCl solution. 8. Fill burette to 0 ml with 0.20 M NaOH solution. 9. Place flask under burette and titrate with the 0.20 M NaOH solution until it turns blue. 10. Measure ml of NaOH used and record the data. 11. Calculate the ml acid used per gram of sample and per tablet, and then record the data. Repeat procedure for all tablets.
Chemical equations:
NaHCO3 + HCl → NaCl + H2O + CO2
Al(OH)3 + 3HCl → AlCl3 + 3H2O
Mg(OH)2 + 2HCl → MgCl2 + 2H2O
Ca(CO3) + 2HCl → CaCl + CO2 + H2O
NaAl(OH)CO3 + 2HCl → 2NaCl + 3H2O + 2CO2 + Al2O3
Data:
antacid tablets | Equate | Tums | Rolaid | Weight of tablet (g) | 1.21 g | 1.35 g | 1.70 g | Weight of sample (g) | 0.84 g | 0.87 g | 0.82 g | Total volume of HCl used (ml) | 60 ml | 50 ml | 50 ml | Final volume of NaOH used (ml) | 7 ml | 2.4 ml | 2 ml | Initial volume of NaOH used (ml) | 0 ml | 0 ml | 0 ml | Total volume of NaOH used (ml) | 7 ml | 2.4 ml