Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Formaldehyde and boiling points

  1. Nov 11, 2007 #1
    Hi guys. I'm looking for boiling points of solutions with Formadehyde and Water.

    I found on ilo.org (http://www.ilo.org/public/english/protection/safework/cis/products/icsc/dtasht/_icsc06/icsc0695.htm) the boiling point of the solution Formaldehyde 37% (and the rest Water), it's 98 Degrees Celcius.

    I would like to know the boiling point of a solution with Formaldehyde 37%, Methanol 1% (and the rest water), as well as of the Formaldehyde 26% or Formaldehyde 23% (and the rest water).
  2. jcsd
  3. Nov 11, 2007 #2
    You need to have the boiling point elevation constant [tex]K_{b}[/tex] for formaldehyde I believe.

    Now, I'd expect the boiling-point elevation equation to work -
    [tex]\Delta[/tex][tex]T_{b}[/tex] = i [tex]K_{b}[/tex] M

    i is 1 for all non-electrolytes.

    M is the molality, moles of solute/kg of solvent

    Boiling point of pure formaldehyde is around -19.3 celsius, 30g/mol

    Hope this helps!
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook