[alt-photo] Re: Decreasing volumes of H2O2

[Joao Ribeiro]

Thank you Alberto.
It's simple :)
Joao


On 02/06/2010, at 17:22, Alberto Novo wrote:

> Joao,
>> I'd like to start again mordançage.
>> The formula I had (and lost)  asked for some 200 vol. H2O2.
>> The formulas I found today ask for 40 volumes H2O2.
>> How do I conver the volumes? From 200 and 135 to 40?
>
> Volume strength is the volumes of oxygen liberated by one volume of  
> hydrogen peroxide solution. One mole (34.02 g) of H2O2 gives 1/2  
> moles of O2, that is (@ 0°C and 1 atm) 22.414/2 = 11.2 volumes of  
> oxygen.
> So, converting from volumes to volumes is equal to converting from  
> moles/L to moles/L.
> So, to convert from volumes to volumes it is enough to apply the  
> simple "cross rule". For example, from 200 to 40 vols:
> 200    40
> \ /
>  40
> / \
> 0    160
>    ---
>    200
> Take 40 parts (volumes) of 200 vols. and 160 parts of pure water (0  
> vols) to make 200 parts of 40 vols. solution.
> Alberto
> www.grupponamias.com
> www.alternativephotography.com/articles/art102.html
>
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