<P> Methylene blue is widely used as a redox indicator in analytical chemistry . Solutions of this substance are blue when in an oxidizing environment , but will turn colorless if exposed to a reducing agent . The redox properties can be seen in a classical demonstration of chemical kinetics in general chemistry , the `` blue bottle '' experiment . Typically , a solution is made of glucose ( dextrose ) , methylene blue , and sodium hydroxide . Upon shaking the bottle , oxygen oxidizes methylene blue , and the solution turns blue . The dextrose will gradually reduce the methylene blue to its colorless , reduced form . Hence , when the dissolved dextrose is entirely consumed , the solution will turn blue again . The redox midpoint potential E ' is + 0.011 mV . </P>
<P> Methylene blue is widely used as a redox indicator in analytical chemistry . Solutions of this substance are blue when in an oxidizing environment , but will turn colorless if exposed to a reducing agent . The redox properties can be seen in a classical demonstration of chemical kinetics in general chemistry , the `` blue bottle '' experiment . Typically , a solution is made of glucose ( dextrose ) , methylene blue , and sodium hydroxide . Upon shaking the bottle , oxygen oxidizes methylene blue , and the solution turns blue . The dextrose will gradually reduce the methylene blue to its colorless , reduced form . Hence , when the dissolved dextrose is entirely consumed , the solution will turn blue again . The redox midpoint potential E ' is + 0.011 mV . </P>
what color is methylene blue in the reduced state
what color is methylene blue in the reduced state
colorless
colorless