In contrast, a nonelectrolyte gives a solution which does not conduct electricity. Nonelectrolytes are generally non-ionic substances. Notice that electrolytes can be ionic compounds, like sodium chloride, or they can be covalent, molecular compounds like hydrogen chloride or hydrogen fluoride, both of which exist as perfectly good polar covalent molecules in the gas phase, but which react in water to dissociate into ions. Strong Electrolytes Strong Electrolytes are completely ionized in aqueous solution in concentrations of 1 M or less. Strong acids are acids which completely dissociate at concentrations of 1 M or less.
Strong bases dissociate or react completely with water to give hydroxide ions.
Weak Electrolytes Weak electrolytes only partially dissociate in aqueous solution in concentrations of 1 M or less. The most common weak electrolytes are weak acids. Note that molarity has various meanings in describing solutions. Commonly molarity refers to the amount of substance dissolved in one liter of liquid to give a solution. Thus the concentration will be 6.024 x 10 -2 M Dilution problems What is the concentration of a solution resulting from adding 25.0 mL of 0.60 M CaCl 2 to 475 mL of water.