3 replies to this topic

[andromeda]

Hi all,

I could really use your help please.

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?

Thank you in advance

[mdfenko]

stock h2o2 is usually 30%. just dilute it 10x.

[phage434]

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.

[andromeda]

Thank you for your replies, it's been really helpful for me