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Topic: % Solution and how to convert a 3% solution to molarity  (Read 840 times)

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Offline IIIIllllIIIlIlIllIlIIIllI

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% Solution and how to convert a 3% solution to molarity
« on: October 21, 2019, 11:24:34 PM »
What does it mean if the concentration of a solution of hydrogen peroxide is "3%"? Does it mean that for every 100mL, there are 3 grams of hydrogen peroxide in the solution? I'm currently doing a redox titration lab where I need to determine the concentration of hydrogen peroxide, where I got an experimental value for molarity of 0.912mol/L. The provided solution of hydrogen peroxide was 3%, but I don't know what 3% means.
Thanks.
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Offline chenbeier

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Re: % Solution and how to convert a 3% solution to molarity
« Reply #1 on: October 22, 2019, 02:30:48 AM »
The percentage is weight percent. 100 g contain 3 g H2O2 To convert to the volume you need the density.
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Offline AWK

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Re: % Solution and how to convert a 3% solution to molarity
« Reply #2 on: October 22, 2019, 03:33:34 AM »
In biology, pharmacy, etc. for diluted water solution often % m/v is used.
At a density of 3% (w/w) H2O2 of about 1.009 g/cm3 this gives less than 1% error.
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