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Chemical indicators give off a visible sign when certain molecules are present. A common use of indicators is in determining the pH of a solution. Adding drops of methyl yellow to a basic solution turns the liquid yellow... More »

www.reference.com Science Chemistry Chem Lab

Five indicators of a chemical change are color change, temperature change, precipitate formation, gas bubble formation and smell or taste change. Since some chemical products are poisonous, detecting a chemical reaction ... More »

www.reference.com Science Chemistry Atoms & Molecules

Harper College explains that forming a precipitate, color changes, gas formation and temperature change are signs of a chemical change. The University of California, Davis adds that the presence of odor also indicates a ... More »

www.reference.com Science Chemistry
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Chemical reactions that release energy are described by Education.com as exothermic reactions, and their equations follow the form: reactants = products + energy. Examples of exothermic reactions are explosions, such as ... More »

www.reference.com Science Chemistry Chem Lab

Phenolphthalein is an indicator that turns from clear to pink in a basic solution, according to Reference.com. In a strongly acidic solution, the indicator is orange, but in the pH range of 0 to 8.2 it is clear. The indi... More »

www.reference.com Science Chemistry Chem Lab

Perform an acid-base titration in the lab by setting up a burette, dissolving the material for analysis in water in a flask, adding an indicator, recording an initial reading of the burette, adding titrant until the colo... More »

www.reference.com Science Chemistry Chem Lab

The function of an indicator in a titration process is to determine the equivalence point when two solutions have reached neutralization. An indicator can either be internal or external. An internal indicator is mixed in... More »

www.reference.com Science Chemistry Chem Lab