Quenched hydrogen combustion to form hydrogen peroxide

Quicktime movie of the demonstration:


Photographs of the demonstration (with explanations)


Without using a flash, one can see the yellow flame of hydrogen burning.  The yellow results from the glass pipet which contains sodium oxide.

Here the stream of hydrogen is playing across an ice cube.

             
In this experiment, 4.65 mL drippings (from H2 flame on ice cube) were collected and then (left) 0.25 mL, (middle) 0.50 mL and (right) 1.07 mL of 0.00082 M KMnO4(aq) were added to the drippings (left picture) and to a similar amount of distilled water (right  picture).  The yellow color is due to manganese(IV) oxide/hydroxide which did not precipitate due to the dilute concentration, 0.00016 M.

Here 5.5 mL drippings (from H2 flame on ice cube) were collected and then 10 drops of 0.90 M KI(aq)/starch solution were added to the drippings (left test tube in leftmost picture) and to a similar amount of distilled water (right test tube in leftmost picture).  The sequence of pictures were taken about one minute apart and show the development of the blue starch-iodine complex.