solubility

Cards (6)

why does salt dissolve in water?
sodium chloride is ionic and water also has a charge
this means they are both polar
rules for something to dissolve
bonds in the substance have to break
bonds in the solvent have to break
new bonds have to form between substance and solvent
why might some things not dissolve?
will only dissolve if the strength of the new bonds formed is the same of greater than the strength of the bonds broken
why might some ionic substances not dissolve water?
this is because the bonding between their ions are too strong
why is aluminium oxide insoluble?
bonds between its ions are are stronger than the bonds it will form with water
aluminium ion has a high charge density
why does oil not dissolve in water?
does not dissolve because the attraction between oil and water is not strong enough to disrupt the hydrogen bonds in the water
bonds formed are weaker than the hydrogen bonds already present in the water