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Lesson Worksheet: Degree of Dissociation Chemistry
In this worksheet, we will practice defining and calculating the degree of dissociation of a weak acid and using it to derive Ostwald’s law of dilution.
Which of the following statements best describes the degree of dissociation of an acid?
- AThe probability that the acid will dissociate in an aqueous solution
- BThe fraction of reactant molecules that dissociate at equilibrium
- CThe total number of hydrogen atoms that can dissociate from a molecule
- DThe concentration of the acid at equilibrium
- EThe fraction of ionic species produced at equilibrium
The equations below show a form of Ostwald’s law of dilution along with its simplified form:
Which of the following approximation results in the simplified form of the equation?
- AWhen is very small, can be approximated to be equal to 1.
- BFor strong acids, approaches 1, and so can be approximated to be equal to 0.
- CWhen is very large, can be approximated to be equal to 0.
- DWhen is very large, can be ignored in the equation.
You are given 5 acidic solutions in a lab experiment, and each acid exhibits a different degree of dissociation, as seen in the table.
|Degree of Dissociation|
Which acid has better electrical conductivity? Assume that their concentration is the same and that room temperature is maintained.
Which of the following is true about weak acids?
- ATheir degree of ionisation is very high.
- BTheir degree of ionisation is very small.
- CThey are completely ionised in water.
- DTheir degree of ionisation is moderate.