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# hydrogen peroxide calculation

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### #1 novagen

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Posted 28 January 2009 - 05:11 AM

Hi all,

I need a simple calculation, i.e conversion of 30% H2O2(FW 34.5)  to 2mM H2O2
Is this right. molarity=%*10/FW

thanx
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### #2 T C

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Posted 28 January 2009 - 06:26 AM

Hello

Use this

Molarity= (weight in grams/FW in grams)*(1000/volume in mL)

If you % is weight/volume then you can use it directly (chk the formula you gave, I think its wrong, but not sure...too tired to chk it ), if its volume/volume then you need to get the weight by using density that will be given on the bottle.

Hope it helps.

TC

### #3 Julio-Claudian

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Posted 29 January 2009 - 05:46 AM

I did the conversion for 96% sulfuric acid as follow:

(96*density*10)/FW

30% H2O2 will have a density of 1.11 and FW of 34.01 (http://www.jtbaker.c...hhtml/H4065.htm). So it'll arrive at about 9.7M. From here, it's M1V1=M2V2

### #4 novagen

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Posted 29 January 2009 - 05:37 PM

Thank a lot TC anf dreamchaser
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