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QUESTION

# Which is more effective at raising the boiling point of a soup? Why? SrBr2 Ca3N2 KCl CH4

"Calcium nitride", mind you I would not want to eat the soup afterwards.

Boiling point elevation is proportional to the number of species in solution; it is a colligative property.

KCl(s) rarr K^+ + Cl^-

SrBr_2(s) rarr Sr^(2+) + 2Br^(-)(aq)

Ca_3N_2(s) + 6H_2O rarr 3Ca^(2+) + 6HO^(-) + 2NH_3(aq)

Calcium nitride would give by far the most particles in solution on a per mole basis, and of course, the ammonia would speciate.

The only such contaminant I would put in my soup would be "sodium chloride". How would this affect the boiling point?

Methane. CH_4, is a volatile, non-ionic species. You could use this to cook the soup.