264 



The NaOH sol. of permanganic acid is much more stable under like con- 

 ditions than the HaSO^ sol. This is shown by the following data: 



From these data we see that the amount of decomposition is within the 

 limit of error in manipulation, for the time and temp. used. 



By increasing the time to 2 hr. and dilution to 50cc there is no appreci- 

 able increase in the amount of decomposition. 



If the temp, be raised to 175°C, the other conditions remaining constant, 

 the dec. rises to 2 per cent. 



In all these cases we have used a xs ^^or. sol. KMnOj ; if xjro ^^e used the 

 decomposition especially with H2SO4 is much greater. 



II. In studying the oxidation properties of the NaOH sol. we followed 

 the outline given by Lentz. We find that by using a Nor. sol. NaOH, a -^^ 

 Nor. KMnO^ Sol. and diluting to a definite volume— lOOcc— the oxidizing 

 properties of this acid is much greater than shown by him. We succeeded in 

 oxidizing 97 per cent, of a standard sol. of grape sugar, even under secondary 

 conditions and obtained constant results in each case. The work on oxi- 

 dation has not been developed, but it appears from what has been done, 

 that this method with the standard NaOH sol. and the sealed tube can be 

 made to completely oxidize such substances as sugar and glycerine. 



