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Because his color is changed depending on the pH.
http://wiki.answers.com/Q/Why_methyl_orange_is_use...
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Methyl Orange is used as an indicator in a titration.It helps us to know the end point of a titration and when do we stop adding the acid or the base. It is yellow in bases,orange
http://wiki.answers.com/Q/Why_methyl_orange_used_i...
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1. Place 1 cup of iron sulfate crystals into 1 gallon of water in a large pot. Heat the water until boiling, then remove it from the heat. 2. Place the fabric inside the solution
http://www.ehow.com/how_8708664_dye-fabrics-methyl...
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It is the best indicator for the situation. For other combinations of acids and bases other indicators are suited better. mostly it is because of how easy their colour changes or
http://wiki.answers.com/Q/Why_methyl_orange_is_use...
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