INTRODUCTION TO HYDROGEN PEROXIDE
physical and chemical
properties - summary
Hydrogen Peroxide (H2O2) solutions are clear, colorless, water-like in appearance, and can be mixed with water in any proportion. At high concentrations, it has a slightly pungent or acidic odor.
H2O2 has a molecular
weight of 34.02 and is nonflammable at any concentration. Its Chemical Abstracts
Service Registry Number is 7722-84-1. Other physical and chemical properties of the two
standard industrial strengths follow.
| H2O2 Concentration | 35% | 50% |
| Active oxygen content, wt.% | 16.5 | 23.5 |
| Density @ 68°: Specific gravity lbs per gallon gms-100% per mL |
1.132 9.45 0.397 |
1.196 9.98 0.598 |
| Apparent pH | 2-3 | 1-2 |
| Acidity, mg/L (as H2SO4) | < 50 | < 50 |
| Total heavy metals, mg/L | < 1 | < 1 |
| Freezing point, ° | -27 | -62 |
| Boiling point, ° | 226 | 237 |
| Vapor pressure @ 86°, mm Hg | 23 | 18 |
| Viscosity: @ 32°, cp @ 68°, cp |
1.81 1.11 |
1.87 1.17 |
| Heat of decomposition, cal/gm | 233 | 335 |
| Mole fraction | 0.22 | 0.346 |
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