Chemistry · Ch 9 — Hydrogen

Physical Properties

9.7.2

In its pure state, $H_2O_2$ is an almost colourless liquid with a very faint pale-blue tint. Its key physical constants are given below.

Table 9.4 — Physical Properties of Hydrogen Peroxide

Property	Value	Property	Value
Melting point (K)	272.4	Density, liquid at 298 K (g cm⁻³)	1.44
Boiling point, extrapolated (K)	423	Viscosity, 290 K (centipoise)	1.25
Vapour pressure, 298 K (mmHg)	1.9	Dielectric constant, 298 K (C² N⁻¹ m⁻²)	70.7
Density, solid at 268.5 K (g cm⁻³)	1.64	Electrical conductivity, 298 K (Ω⁻¹ cm⁻¹)	$5.1\times10^{-8}$

$H_2O_2$ is miscible with water in all proportions and forms a definite hydrate, $H_2O_2\cdot H_2O$ (melting point 221 K). …

Table 9.4Physical Properties of Hydrogen Peroxide

Melting point/K	272.4	Density (liquid at 298 K)/g cm^-3	1.44
Boiling point(extrapolated)/K	423	Viscosity (290K)/centipoise	1.25
Vapour pressure(298K)/mmHg	1.9	Dielectric constant (298K)/C^2/N m^2	70.7