What is the best antacid?

Determine the best antacid using any criteria you choose, but be able to defend your choice of the best antacid out of a least three tested having the same molarity. Use a universal indicator or electronic pH measurement device to determine when the pH has changed one unit.
The measurement of hydrogen ion concentration is called pH. Around the value of zero you have a strong acid or an acid that produces lots of hydrogen or H+ ions. At pH 7 the solution has equal amounts of acidic and basic ions and is called neutral. Pure water is pH 7 because it has equal amounts of H+ and hydroxide or OH- ions. Antacids work against pH 1 - 3 of stomach acid so use 0.1 M HCl to simulate stomach acid.
Common Name                Chemical Name         Formula
Alka-Seltzer               sodium bicarbonate    NaHCO3

Digel                      aluminium hydroxide   Al(OH)3

Philip's Milk of Magnesia  magnesium hydroxide   Mg(OH)2
 
Tums                       calcium carbonate     CaCO3

Rolaids   dihydroxy aluminium sodium carbonate   Al(OH)2NaCO3

Maalox    magnesium hydroxide and aluminium hydroxide

Mylanta   magnesium hydroxide and aluminium hydroxide



Equations


H+ + NaHCO3-----> Na+ + CO2 + H2O 

2H+ + CaCO3-----> Ca+2 + CO2 + H2O 

3H+ + Al(OH)3-----> Al+3 + 3 H2O 

2H+ + Mg(OH)2-----> Mg+2 + 2 H2O

Aluminium and calcium hydroxides can cause constipation.
Magnesium hydroxide can act as a laxative.
Sodium bicarbonate dissolves quickly, but lasts only five (5) minutes and should not be used by people with hypertension.
Calcium carbonate would be good for people concerned about osteoporosis.
The blood bicarbonate buffer system follows:

H+ + HCO3-1 <--> H2CO3 <--> CO2 + H2O

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