# Formaldehyde and boiling points

1. Nov 11, 2007

### giankyr

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. Nov 11, 2007

### staf9

You need to have the boiling point elevation constant $$K_{b}$$ for formaldehyde I believe.

Now, I'd expect the boiling-point elevation equation to work -
$$\Delta$$$$T_{b}$$ = i $$K_{b}$$ 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!