December 15, 2024, 02:01:53 AM
Forum Rules: Read This Before Posting


« previous next »
Pages: [1]   Go Down

Topic: % Solution and how to convert a 3% solution to molarity  (Read 1214 times)

0 Members and 2 Guests are viewing this topic.

Offline IIIIllllIIIlIlIllIlIIIllI

  • Very New Member
  • *
  • Posts: 1
  • Mole Snacks: +0/-0
% 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.
Logged

Offline chenbeier

  • Sr. Member
  • *****
  • Posts: 1337
  • Mole Snacks: +102/-22
  • Gender: Male
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.
Logged

Offline AWK

  • Retired Staff
  • Sr. Member
  • *
  • Posts: 7976
  • Mole Snacks: +555/-93
  • Gender: Male
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.
Logged
AWK
Pages: [1]   Go Up
« previous next »
Sponsored Links