Chemistry of +1 iodine in alkaline solution
- Univ. of California, Berkeley, CA (United States)
The iodine species formed either by adding hypochlorite to a basic iodide solution or by adding triiodide to sodium hydroxide, was identified as hypoiodite ion. The absorption spectrum of IO- was investigated in the wavelength range from 450 mμ to 280 mμ. The kinetics of the reaction I- + ClO- = IO- + Cl- was studied spectrophotometrically in alkaline solution. The forward rate law was found to be d(IO-)/dt = k(I-)(ClO-)/OH-. At 25 C and an ionic strength of 1.00 M, k is 61 ± 3 sec-. It was found spectrophotometrically that for certain ratios of the initial iodide to hydroxide concentrations, there was evidence of the presence of I3-, I2OH-, and I2O2- along with IO-. The equilibrium constants between IO- and these three species were evaluated by a graphical method. The formal potential of the cell: Pt:H2:1 M NaOH : 1M NaOH, KI, NaIO : Au was found to be 1.297 v at 25 C. The equilibrium constant, K2 = (I3-)(OH-)-2/(IO-)(I-)2, of the reaction IO- + 2I- + H2O ⇌ I3- + 2OH- calculated from emf measurements agreed well with that from spectrophotometric measurements. The ionization constant of HOI was calculated to be 2.3 x 10-11 at 25 C.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- US Atomic Energy Commission (AEC)
- DOE Contract Number:
- AC02-05CH11231
- OSTI ID:
- 932596
- Report Number(s):
- UCRL-8311; TRN: US200813%%48
- Country of Publication:
- United States
- Language:
- English
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