what is the best insulation for homes that is not a fire hazzard? Is spray foam good?
Aluminium bromide has such a large covalent character that it is better to think of it as a covalent, non-polar moleculeThus it is not surprising that it is soluble in non-polar benzeneAluminium fluoride is much more ionic in character.
The answers you received sound very plausibleLet me throw a fly into the ointmentWhat about match up of molecular size? Is AlBr3 closer in size to Benzene than AlF3Remember in covalent solvation size match up becomes a powerful influenceI phrased this as a question rather than an answer because I don’t know this for sure, but it is something for you to think aboutSome situations might encourage deeper consideration, this sound like one.Great question.
Liquid benzene is made up of covalently bonded moleculesThe electronegativity of C is 2.5 and H is 2.1The difference in electronegativities between C and H is 0.4 and between C-C atoms is 0.Therefore the bonds are all covalentBenzene will dissolve covalent molecules very well and ionicly bonded compounds not well or at allThe electronegativity of Al is 1.5 while Br is 2.8 and F is 4.0If the electronegativity difference across a bond is less than 1.7 it is considered to be covalentIf it is greater than 1.7 it is considered to be ionic in natureThe difference in electronegativity for the Al-Br bond is 1.3 and is therefore a covalent bondThe electronegativity difference for Al-F is 2.5 and is therefore an ionic bond The rough rule is that Like dissolves likeTherefore covalent benzene will dissolve covalent aluminium bromide but will not dissolve ionic aluminium fluoride.
You don't mention if this is new or existing constructionIf it is new I would use styrofoam on the outside and fiberglass bats between the wall studs and in the ceiling on the insideIf it is existing you will have to hire a contractor to spray the insulation into the walls from the outside of the houseGood Luck
