Editing Hydrogen peroxide (section)

===Aqueous solutions===
In [[aqueous solution]]s, hydrogen peroxide forms a [[eutectic]] mixture, exhibiting [[freezing-point depression]] down as low as −56&nbsp;°C; pure water has a freezing point of 0&nbsp;°C and pure hydrogen peroxide of −0.43&nbsp;°C. The boiling point of the same mixtures is also depressed in relation with the mean of both boiling points (125.1&nbsp;°C). It occurs at 114&nbsp;°C. This boiling point is 14&nbsp;°C greater than that of pure water and 36.2&nbsp;°C less than that of pure hydrogen peroxide.<ref>{{cite web|url=https://www.h2o2.com/intro/FMC_MSDS_40_to_60.pdf|title=Hydrogen Peroxide Technical Library|access-date=3 March 2016|archive-url=https://web.archive.org/web/20091229052623/https://www.h2o2.com/intro/FMC_MSDS_40_to_60.pdf|archive-date=29 December 2009|url-status=dead}}</ref>

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[[File:Phase diagram hydrogen peroxide water.svg|class=skin-invert-image|423px|thumb|[[Phase diagram]] of {{chem2|H2O2}} and water: Area above blue line is liquid. Dotted lines separate solid–liquid phases from solid–solid phases.]]
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{| class="wikitable"
|+ Density of aqueous solution of {{chem2|H2O2}}
|-
! {{chem2|H2O2}} ([[w/w]]) !! Density<br>(g/cm<sup>3</sup>) !! Temp.<br>(°C)
|-
| 3% || 1.0095 || 15
|-
| 27% || 1.10 || 20
|-
| 35% || 1.13 || 20
|-
| 50% || 1.20 || 20
|-
| 70% || 1.29 || 20
|-
| 75% || 1.33 || 20
|-
| 96% || 1.42 || 20
|-
| 98% || 1.43 || 20
|-
| 100% || 1.45 || 20
|}
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Hydrogen peroxide is most commonly available as a solution in water. For consumers, it is usually available from pharmacies at 3 and 6 [[wt%]] concentrations. The concentrations are sometimes described in terms of the volume of oxygen gas generated; one milliliter of a 20-volume solution generates twenty milliliters of oxygen gas when completely decomposed. For laboratory use, 30 wt% solutions are most common. Commercial grades from 70% to 98% are also available, but due to the potential of solutions of more than 68% hydrogen peroxide to be converted entirely to steam and oxygen (with the temperature of the steam increasing as the concentration increases above 68%) these grades are potentially far more hazardous and require special care in dedicated storage areas. Buyers must typically allow inspection by commercial manufacturers.