Dissolving Process
How Do Particles Dissolve in Each Other?
Mr. O’Brien (std.6B)
1. What is the first thing that solutes and solvents
must do in order for the solvent to dissolve the
solute?
2. Explain how solute and solvent particles move in a
solution.
3. Compare the terms soluble & insoluble.
Attractive Forces Between Solute & Solvent
4. If the force that holds the solute together is WEAKER than the force between the solvent and
solute, what would the mixture look like?
5. If the force that holds the solute together is STRONGER than the force between the solute and
solvent, what would the mixture look like?
Mixture
NaCl (ionic) in Hexane (nonpolar)
Benzene (nonpolar) in Cyclohexane (nonpolar)
NaCl (ionic) in Water
Wax (nonpolar) in Water
Water in methanol (polar)
Solutions
(Yes/No)
Like Dissolves Like Idea
It is known that the solute NaCl (salt) can ionize in the solvent H2O.
1. Provide an explanation as to why salt is able to dissolve
in water.
2. Water is known to form cages around the ions.
Accurate illustrate how water forms these cages
around the following ions.
3. What can be said about the attractive forces of
between the solute and the solvent if dissolving
occurs?
More Practice on solubility
A student is observing the potential solubility of three substances. The Following is his data:
Substance “A” makes a homogenous mixture in H2O.
Substance “B” makes a homogenous mixture in solution “C”.
Substance “A” is insoluble in solution “C”.
1. Make a prediction between the combinations of solution A-B. Back-up your prediction with evidence from the student’s
observations.
2. Given your understanding of the structure of water, would this hydrocarbon by able to dissolve in water? Explain your
answer.
3. What type of molecule is substance A based on the picture below? Explain your answer.