[vnveteran]

Which solute would cause water to have a higher boiling point? MgCl2 or KCl.  Please Explain. 

[freezard7734]

Remember that the boiling point elevation is proportional to the van't Hoff factor, which is the number of separate species formed from the solution of one molecule/compound. So, for example, the van't Hoff factor of NaI is 2, since NaI dissolve to give Na+ and I-.

[Schrödinger]

Remember that the boiling point elevation is proportional to the van't Hoff factor, which is the number of separate species formed from the solution of one molecule/compound. So, for example, the van't Hoff factor of NaI is 2, since NaI dissolve to give Na+ and I-.

I case of KCl, we can assume complete dissociation and take i=2.(Van't Hoff factor)

But in cases such as MgCl₂, don't you also need to take into account its hydrolysis (the equilibrium thingy?...just to be accurate)

[Borek]

But in cases such as MgCl₂, don't you also need to take into account its hydrolysis (the equilibrium thingy?...just to be accurate)

In general - yes.

[vnveteran]

im sorry...im still loss on which solute would cause water to have a higher boiling point??? would it be mgcl2 because of electronegativity? 

[Schrödinger]

Well, if you were to consider complete dissociation of ions, then $$ i=3 /$$ for MgCl₂ and $$ i=2 /$$ for KCl.

So, elevation in boiling point being directly proportional to $$ i /$$, it would be greater for MgCl₂.