Many ionic and covalent compounds dissolve well in water. This is because..
a. the temperature of liquid water is high enough to allow anything to mix well with its fast moving particles.
b. The air pressure above the water is greater than the pressure exerted by the moving water particles.
c. the solute particles are small enough to fit in the spaces between the tightly packed solvent particles.
d. the attraction between the solute and solvent is about as strong as the attraction between the solvent particles.
it should be D
sorry for my poor English, I’m not from Canada
In order to dissolve sth.
these things will happen
1. solvent – solvent attractions are broken down
2. solute – solute attractions are broken down
3. solute – solvent attractions are built up
To let this occurs
the solute – solvent attraction should be the strongest force among solvent-solvent; solute-solute ; solute solvent or at least similar strength
As water is a polar solvent
sth can dissolve in water should be able to form Hydrogen bond wif solute molecules
sth which is polar are also can be slightly soluble
for example carboxylic acid (-COOH) can form extensive hydrogen bond with water, it is soluble in water then.
On the contrary, Alkane is neither polar nor hydrogen-bond-forming molecules, it do not dissolve in water.
(this is the case of covalent compound
all ionic compound are soluble in water
there are mainly 5 steps for the dissolution process
ionic compounds adopt giant ionic structure
cations and anions are alternatively held together by non-directional electrostatic force ( ionic bond)
Water is a kind of polar molecule, there are permanent dipole moment acting on it. H atoms carry a slightly positive charge while O atoms carry slightly negative charge.
attraction between H atoms in water molecules and anions in the ionic compound,attraction between O atoms in water molecules and cationsin the ionic compound are stronger than the ionic bond.
Therefore, cations and anions are pulled away from the ionic lattice and dissolved in water
Make a little conclusion for the concept
1. ionic compound : cations <–ionic bond–> anions
2. Water: H2O : H(slightly +ve) ; O(slightly -ve)
3. H2O’s O<–attraction–>cations <–ionic bond–> anions<–attraction–>H2O’s H
4. attraction > ionic bond
5. structure of ionic compound is broken down!
* finally product will be… =>H2O’s O<–attraction–>cations & anions<–attraction–>H2O’s H
to sum up
the major factor is the solute-solvent attraction is strong enough => soluble
hope can help
Meteor from H.K.Source(s): myself~