Video: Color Indicator Play
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The water in the first beaker colors the indicator green. In the second beaker, the water turns from red to blue, in the third, purple and red in the fourth.
The reason for the color change are the acids and alkalies in the beakers. Indicators are weak organic acids and alkalies which change color in the presence of protons (H+) or Hydroxide ions (OH-). The universal indicator is a mixture of several indicators (mostly Thymol Blue, Bromothymol Blue, Methyl red and Phenolphthalein), which changes its color depending of the pH value of the solution.
Learn more about this experiment here: http://www.science-tube.com/index.php?c=chemie§ion=067
Source: http://www.science-tube.com/
The reason for the color change are the acids and alkalies in the beakers. Indicators are weak organic acids and alkalies which change color in the presence of protons (H+) or Hydroxide ions (OH-). The universal indicator is a mixture of several indicators (mostly Thymol Blue, Bromothymol Blue, Methyl red and Phenolphthalein), which changes its color depending of the pH value of the solution.
Learn more about this experiment here: http://www.science-tube.com/index.php?c=chemie§ion=067
Source: http://www.science-tube.com/
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