Alka Seltzer And Mylanta Antacid Test

Words: 1051
Pages: 5
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Aim
To investigate the effectiveness of the Alka Seltzer and Mylanta antacid tablets when reducing acidity of hydrochloric acid.

Independent variable – Different brands of antacid tablets.
Dependent variable – The effectiveness of the Alka Seltzer and Mylanta antacid tablets at neutralising hydrochloric acid by measuring its pH.

Control variables
1. Same volume of hydrochloric acid solution.
2. Same concentration of hydrochloric acid.
3. Same amount of antacid tablets (1 tablet for each solution)
4. Crushing the antacid tablets likewise.
5. Same mL beaker.
6. Same temperature.

Materials
• 100mL of 0.1 M hydrochloric acid solution
• 2 250 mL beaker
• 4 pieces of universal indicator paper
• 1 pipette
• 1 Alka Seltzer antacid tablet …show more content…
Alka Seltzer and Mylanta antacid tablets both equally reduced the level of acidity of 50ml hydrochloric solution they were dissolved in. This was known because both have the same pH of solution after the antacid was added. Both antacid tablets increased the pH by 2, from pH4 to pH6.
However, the Alka Seltzer antacid tablet was slightly bigger than the Mylanta antacid tablet. This means that the larger antacid tablet (Alka Seltzer) requires more product to effectively reduce acidity. This would make the Alka Seltzer tablet harder to swallow. On the other hand, the Mylanta antacid tablet is more concentrated as there is less of it. Despite of this, the Alka Seltzer antacid tablet dissolved and reacted faster than the Mylanta antacid tablet. This would give quicker relief for the user. Therefore, Alka Seltzer antacid tablet is more efficient when reducing the level of acidity of the hydrochloric solution.

Discussion
The antacid tablets neutralised the hydrochloric acid and reduced its acidity. This is called a neutralisation reaction. The active ingredient in antacid tablet is calcium carbonate, which neutralises the hydrochloric acid. The calcium carbonate reacts with the hydrochloric acid and produces calcium chloride and water.
HCl + CaCO3 → CaCl2 + H2O

Discussion …show more content…
The smaller Mylanta antacid tablet may be more concentrated. This may affect the control variable of having the same amount of antacid tablet in each experiment. The use of the mortar and pestle is also a weakness as it is difficult to crush them similarly. The control variable of crushing the antacid tablets likewise would be affected. The antacid tablets may be crushed differently, and therefore this may affect its solubility. Another weakness of the procedure is that each experiment was only done once. If both experiments were repeated multiple times, the results would be more
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