hydrogen peroxide Flashcards
H2O2 is discovered by
J.L. Thenard
preparation of H2O2
- action of sulphuric acid on barium peroxide
- electrolysis of acidified sulphate soln and then hydrolysis
- auto-oxidation of 2-ethylanthraquinol
BaO2.8H2O + H2SO4 –>
preparation of H2O2
BaSO4 + H2O2 + 8H2O
prep of H2O2 by electrolysis of HSO4-
2HSO4- —> HO3SOOSO3H + 2e-
electrolysis
HO3SOOSO3H —> 2HSO4- + 2H+ + H2O2
hydrolysis
laboratory prep of D2O2 is done by which method
electrolytic oxidation and then further hydrolysis
K2S2O8 + 2D2O –> 2KDSO4 + D2O2
on industrial scale, H2O2 is produced by
auto-oxidation of 2-ethylanthraquinols
on industrial scale, H2O2 is produced by
auto-oxidation of 2-ethylanthraquinols
H2O2 physical properties
- syrupy liquid
- gives bluish tinge in thick layers
- soluble in water, alcohol in all proportions
which is more viscous
H2O or H2O2
H2O2 is more viscous
h2o2 is associated with more h bonding
volume of H2O2 (V) =
M x 11.2
strength of H2O2 =
68V / 22.4
h2o2 structure
open book type
dihedral angle of h2o2 in gas phase
111.5 degrees
dihedral angle of h2o2 in solid phase
90.2 degrees
H2O2 in acidic medium
H2O2 –> 2H+ + O2 + 2e-
H2O2 in basic medium
H2O2 + 2OH- –> 2H2O + O2 + 2e-
H2O2 has ___ number of ionisable H atoms
2
it forms _____ number of series of salts
2
CH2=CH2 + H2O2 –>
CH2OH - CH2OH
ethane 1,2 - diol
h2o2 is a good bleaching agent due
nascent oxygen which it liberate on decomposition
nascent O combines with coloring matter which in turn gets oxidised
decomposition of h2o2 is catalysed by
sunlight, metal surfaces, glass, alkali, dust, etc.
h2o2 is stored in
wax-lined glass or plastic vessel in dark
urea is added as stabiliser
urea is used in storage of h2o2 as a
stabiliser
why h2o2 is kept away from dust
it induces explosive decomposition of compound
