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# preparation of hydrogen peroxide

hydrogen peroxide molarity calculations

3 replies to this topic

### #1 andromeda

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Posted 04 December 2012 - 12:36 PM

Hi all,

I would like to prepare a 3% solution of hydrogen peroxide (H2O2) equal to 0.88M. My stock bottle of H2O2 is at 9.8M (in liquid form).

Could you help me calculate how to get the desired 3% solution of H2O2 that will be equal to 0.88M?

### #2 mdfenko

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Posted 04 December 2012 - 01:03 PM

stock h2o2 is usually 30%. just dilute it 10x.
talent does what it can
genius does what it must
i do what i get paid to do

### #3 phage434

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Posted 04 December 2012 - 01:04 PM

1) You could go to a grocery store or pharmacy and pick up a bottle of hydrogen peroxide -- the "home use" version is 3%.

2) If you want to dilute your stock, you need to dilute by 9.8 moles/liter divided by 0.88 moles/liter or by a factor of 11.1.

So, to make 1 liter, you need 1/11.1 liters of stock = 90 ml of stock, with the remainder, 910 ml, water.

Concentrated hydrogen peroxide is quite hazardous. Be careful.

### #4 andromeda

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Posted 05 December 2012 - 10:31 AM