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Dilute H2O2
Posted: 20 Jun 2007, 11:39
by Marjan
Hi;
I need to make up 250ml of 6% H2O2 from 35% H2O2.Anyone out there has any idea how? any helps welcome.
Cheers
Re: Dilute H2O2
Posted: 20 Jun 2007, 15:49
by dime
For ease of measurement use 50ml 35% H2O2 to 250ml distilled water to give 300ml total. You can buy 6% H2O2 but I got caught recently with the 35% and watered it down as mentioned, with no complaints. Good luck!
Re: Dilute H2O2
Posted: 21 Jun 2007, 12:15
by estelle
Did you know that this has a fairly short shelf life so don't buy large amounts and it
needs to be kept in the fridge?
Estelle
Re: Dilute H2O2
Posted: 21 Jun 2007, 14:35
by Mother
Hi All
H2O2 will convert back to H2O after a certain period of time.
To test if the peroxide is still active try this:
Pour a small amount of peroxide in a test tube, then put a very small amount of Manganese Dioxide powder in. If it fizzes up then it is still ok and can be used. Just be careful as it can get a little hot.
Take care
Mother
Re: Dilute H2O2
Posted: 21 Jun 2007, 14:40
by Mother
Oops!!!!
Thought subscript would lower the numbers only.
Mother
Re: Dilute H2O2
Posted: 28 Jun 2007, 14:31
by Anastasia
When diluting any liquid simply use the formula
M1 x V1 = M2 x V2
where M = concentration
V = volume
So to make up 250ml of 6% hydrogen peroxide from 35%
0.35 x V1 = 0.06 x 0.250
therefore V1 = 0.043
this means that you take 43ml of the 35% hydrogen peroxide and then add distilled water to make up 250ml in total (ie. add 207 ml don't just add 250ml)
hope this is not too confusing
Anastasia