![]() ![]() Steve Spangler Science web site – Milk of Magnesia Experiment – Color Changing Liquid Teaches Science Behind Antacids.Solutions produced may be flushed down the drain with copious amounts of water. As with all demonstrations, appropriate safety goggles, gloves and lab attire should be used. Avoid vigorous solution stirring to prevent spillage. In time, all of the vinegar (acid) will react with the magnesium hydroxide and the solution will remain red and clear. The mixture changes through the entire Universal Indicator color range. Add more vinegar and watch as the liquid goes from red to orange to yellow to green and eventually settles at the bluish-purple color. However, as more of the Mg(0H)2 from the suspension gradually dissolves into solution, the acid is neutralized and eventually the solution becomes basic. The acid neutralizes the small amount of hydroxide ion from the Mg(0H)2 that has dissolved first, then turns the solution acidic. The pink colour disappears almost instantly, showing that the hydroxide ions have been neutralized very quickly, and replaced by an excess of hydrogen ions. The mixture quickly changes to red because the acid disperses throughout the beaker. ![]() ![]() While stirring the solution, add 10-20 mL of vinegar (depending on your setup) and observe the rapid color change. Observe that the solution turns a light blue, indicating that it is slightly basic due to the small amount of dissolved Mg(OH)2. Use the lighted magnetic stirrer to create a steady mix of the liquids. The Universal Indicator will turn red on the far acidic end of the scale and dark blue on the alkaline side. Place about 100 mL of Milk of Magnesia in a 500 mL beaker and dilute with tap water until the beaker is about half full. Magnetic stirring bar and stirring plate, preferably lighted from below.5% acetic acid)- available from any grocery store. Universal Indicator - available from any chemical supplier.Milk of Magnesia – any brand should work - primary ingredient should be magnesium hydroxide - Mg(0H)2.Milk of Magnesia has a neutralizing effect on stomach acid – this experiment shows its effects. An insoluble base in water dissolves in the presence of acid. Indicators are substances which have distinctly different colors in acidic or basic media. Magnesium hydroxide reacts with acid to form water and magnesium ions: Mg(OH) 2 (s) + 2 H 3O + (aq) = 4 H 2O (l) + Mg 2+ (aq) composition, neoprene rubber reinforcing agent, drying agent and color retention in. Procedure demonstrates the neutralizing effect of magnesium hydroxide on an acid, color change of indicators with pH, and vividly illustrates how a commercial antacid works. Precipitation Rate Investigation on Precipitated Magnesium Carbonate. As the suspended solid is consumed, the solution becomes clear. The indicator changes color as the acid is neutralized. A solution of milk of magnesia and universal indicator in water is stirred while acetic acid is added. ![]()
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