Sept., -1932
3499
HYDROGEN PEROXIDE AND IODINE-IODIDE
weak acid by a strong base. The titer deviation is compared with the titer error due to inaccuracy of e. m. f. measurement. The absolute titration since it is inherently four times as sensitive as the inflection point titration might advantageously replace the latter when the titer error is above about 1%. NEW BRUNSWICK, NEW JERSEY [CONTRIBUTION FROM THE CHEMICAL LABORATORY O F THE UNIVERSITY
OF
CALIFORNIA]
THE CATALYTIC DECOMPOSITION OF HYDROGEN PEROXIDE BY THE IODINE-IODIDE COUPLE. I1 AND 111. THE RATE OF OXIDATION IN NEUTRAL, AND IN ACID, SOLUTION OF HYDROGEN PEROXIDE BY IODINE BY HERMAN A. LIEBHAFSKY PUBLISHSD SEPTEMBER 5, 1932
RECEIVED APRIL8, 1932
11. THE RATE OF OXIDATION, IN NEUTRAL SOLUTION, OF HYDROGEN PEROXIDE BY IODINE In certain investigations of the catalytic decomposition of hydrogen peroxide by the iodine-iodide couple,l it has been postulated that the reaction 12
+ Hz02 = 2H+ + 21- + Or
(1)
proceeds through the rate-determining steps IO-
and
+ Hz01 kn = 3(10'1)
I-
+ HnOi-H+
