Dissociation - Questions

The Dissociation Concept Builder is comprised of 54 questions. The questions are divided into 18 different Question Groups and spread across three activities. Questions in the same group are rather similar to one another. The Concept Builder is coded to select at random a question from each group until a student is successful with that group of questions.

There are three activities in this Concept Builder. Those three activities are differentiated as follows:
 

• Ion ID: Question Groups 1-6 ... Given the formula or the name of an ionic compound, identify the formula (with charges) of the cation and the anion in the compound.
• Dissociation Equation: Question Groups 7-12 ... Given the formula or the name of an ionic compound, create the balanced chemical equation for the dissociation of that compound in water.
• Ion Concentration: Question Groups 13-18 ... Given the name of a strong electrolyte and the molarity of that strong electrolyte, determine the concentration of the ions in aqueous solution.

The questions from each group are shown below. Teachers are encouraged to view the questions in order to judge which activities are most appropriate for their classes. We recommend providing students two or more options. 

The Physics Classroom grants teachers and other users the right to print these questions for private use. Users are also granted the right to copy the text and modify it for their own use. However, this document should not be uploaded to other servers for distribution to and/or display by others. The Physics Classroom website should remain the only website or server from which the document is distributed or displayed. We also provide a PDF that teachers can use under the same conditions. We have included a link to the PDF near the bottom of this page.

 

Dissociation

 

Activity 1: Ion ID
Question Group 1
Question 1
Consider the ionic compound having the formula NH₄I. It dissociates into ions when it dissolves in water. Identify the formula (including the charge) of the ions that are formed from its dissociation.
 
 
Question 2
Consider the ionic compound having the formula NH₄Cl. It dissociates into ions when it dissolves in water. Identify the formula (including the charge) of the ions that are formed from its dissociation.
 
 
Question 3
Consider the ionic compound having the formula NH₄Br. It dissociates into ions when it dissolves in water. Identify the formula (including the charge) of the ions that are formed from its dissociation.
 
 
 
 
Question Group 2
Question 4
Consider the ionic compound having the formula Al₂(SO₄)₃. It dissociates into ions when it dissolves in water. Identify the formula (including the charge) of the ions that are formed from its dissociation.
 
 
Question 5
Consider the ionic compound having the formula Fe₂(SO₄)₃. It dissociates into ions when it dissolves in water. Identify the formula (including the charge) of the ions that are formed from its dissociation.
 
 
Question 6
Consider the ionic compound having the formula Cr₂(SO₄)₃. It dissociates into ions when it dissolves in water. Identify the formula (including the charge) of the ions that are formed from its dissociation.
 
 
 
 
Question Group 3
Question 7
Consider the ionic compound having the formula Zn₃(PO₄)₂. It dissociates into ions when it dissolves in water. Identify the formula (including the charge) of the ions that are formed from its dissociation.
 
 
Question 8
Consider the ionic compound having the formula Cu₃(PO₄)₂. It dissociates into ions when it dissolves in water. Identify the formula (including the charge) of the ions that are formed from its dissociation.
 
 
Question 9
Consider the ionic compound having the formula Ca₃(PO₄)₂. It dissociates into ions when it dissolves in water. Identify the formula (including the charge) of the ions that are formed from its dissociation.
 
 
 
 
Question Group 4
Question 10
Consider the ionic compound named copper(II) chloride. It dissociates into ions when it dissolves in water. Identify the formula (including the charge) of the ions that are formed from its dissociation.
 
 
Question 11
Consider the ionic compound named lead(II) chloride. It dissociates into ions when it dissolves in water. Identify the formula (including the charge) of the ions that are formed from its dissociation.
 
 
Question 12
Consider the ionic compound named iron(II) chloride. It dissociates into ions when it dissolves in water. Identify the formula (including the charge) of the ions that are formed from its dissociation.
 
 
 
 

 
Question Group 5
Question 13
Consider the three ionic compounds named below. Each compound dissociates when dissolved in water. Identify the formula (including the charge) of the cation and the anion formed from the dissociation of each compound.
 

Compound Name	Cation Formula	Anion Formula
Sodium sulfide
Sodium sulfate
Sodium sulfite

 
 
Question 14
Consider the three ionic compounds named below. Each compound dissociates when dissolved in water. Identify the formula (including the charge) of the cation and the anion formed from the dissociation of each compound.
 

Compound Name	Cation Formula	Anion Formula
Sodium sulfate
Sodium sulfite
Sodium sulfide

 
 
Question 15
Consider the three ionic compounds named below. Each compound dissociates when dissolved in water. Identify the formula (including the charge) of the cation and the anion formed from the dissociation of each compound.
 

Compound Name	Cation Formula	Anion Formula
Sodium sulfite
Sodium sulfide
Sodium sulfate

 
 

 
Question Group 6
Question 16
Consider the three ionic compounds named below. Each compound dissociates when dissolved in water. Identify the formula (including the charge) of the cation and the anion formed from the dissociation of each compound.
 

Compound Name	Cation Formula	Anion Formula
Calcium nitride
Calcium nitrate
Calcium nitrite

 
 
Question 17
Consider the three ionic compounds named below. Each compound dissociates when dissolved in water. Identify the formula (including the charge) of the cation and the anion formed from the dissociation of each compound.
 

Compound Name	Cation Formula	Anion Formula
Calcium nitrate
Calcium nitrite
Calcium nitride

 
 
Question 18
Consider the three ionic compounds named below. Each compound dissociates when dissolved in water. Identify the formula (including the charge) of the cation and the anion formed from the dissociation of each compound.
 

Compound Name	Cation Formula	Anion Formula
Calcium nitrite
Calcium nitride
Calcium nitrate

 

 
Activity 2: Dissociation Equations
Question Group 7
Question 19
Create the balanced chemical equation that describes the dissociation of CaCl₂into ions when dissolved in water. Identify the ions and their coefficients on the product side of the equation.
 
 
Question 20
Create the balanced chemical equation that describes the dissociation of BaCl₂into ions when dissolved in water. Identify the ions and their coefficients on the product side of the equation.
 
 
Question 21
Create the balanced chemical equation that describes the dissociation of MgCl₂into ions when dissolved in water. Identify the ions and their coefficients on the product side of the equation.
 
 
 
 
Question Group 8
Question 22
Create the balanced chemical equation that describes the dissociation of Al(NO₃)₃into ions when dissolved in water. Identify the ions and their coefficients on the product side of the equation.
 
 
Question 23
Create the balanced chemical equation that describes the dissociation of Fe(NO₃)₃into ions when dissolved in water. Identify the ions and their coefficients on the product side of the equation.
 
 
Question 24
Create the balanced chemical equation that describes the dissociation of Cr(NO₃)₃into ions when dissolved in water. Identify the ions and their coefficients on the product side of the equation.
 
 
 
 

 
Question Group 9
Question 25
Create the balanced chemical equation that describes the dissociation of Na₃PO₄into ions when dissolved in water. Identify the ions and their coefficients on the product side of the equation.
 
 
Question 26
Create the balanced chemical equation that describes the dissociation of K₂SO₄into ions when dissolved in water. Identify the ions and their coefficients on the product side of the equation.
 
 
Question 27
Create the balanced chemical equation that describes the dissociation of Na₂CO₃into ions when dissolved in water. Identify the ions and their coefficients on the product side of the equation.
 
 
 
Question Group 10
Question 28
Create the balanced chemical equation that describes the dissociation of ammonium sulfide into ions when dissolved in water. Identify the ions and their coefficients on the product side of the equation.
 
 
Question 29
Create the balanced chemical equation that describes the dissociation of ammonium phosphide into ions when dissolved in water. Identify the ions and their coefficients on the product side of the equation.
 
 
 
Question 30
Create the balanced chemical equation that describes the dissociation of ammonium selenide into ions when dissolved in water. Identify the ions and their coefficients on the product side of the equation.
 
 
 

 
Question Group 11
Question 31
Create the balanced chemical equation that describes the dissociation of copper(II) phosphate into ions when dissolved in water. Identify the ions and their coefficients on the product side of the equation.
 
 
Question 32
Create the balanced chemical equation that describes the dissociation of lead(II) phosphate into ions when dissolved in water. Identify the ions and their coefficients on the product side of the equation.
 
 
Question 33
Create the balanced chemical equation that describes the dissociation of iron(II) phosphate into ions when dissolved in water. Identify the ions and their coefficients on the product side of the equation.
 
 
 
 
Question Group 12
Question 34
Create the balanced chemical equation that describes the dissociation of aluminum sulfate into ions when dissolved in water. Identify the ions and their coefficients on the product side of the equation.
 
 
Question 35
Create the balanced chemical equation that describes the dissociation of iron(III) sulfate into ions when dissolved in water. Identify the ions and their coefficients on the product side of the equation.
 
 
Question 36
Create the balanced chemical equation that describes the dissociation of chromium(III) sulfate into ions when dissolved in water. Identify the ions and their coefficients on the product side of the equation.
 
 
 
 
 
 

 
Activity 3: Net Ionic Equations
Question Group 13
Question 37
The ionic compound magnesium chloride is a strong electrolyte that completely dissociates when dissolved in water. Determine the concentration of the two ions in an aqueous solution of 1.20 M magnesium chloride.
 
 
Question 38
The ionic compound barium chloride is a strong electrolyte that completely dissociates when dissolved in water. Determine the concentration of the two ions in an aqueous solution of 1.20 M barium chloride.
 
 
Question 39
The ionic compound calcium chloride is a strong electrolyte that completely dissociates when dissolved in water. Determine the concentration of the two ions in an aqueous solution of 0.60 M calcium chloride.
 
 
 
 
Question Group 14
Question 40
The ionic compound sodium phosphate is a strong electrolyte that completely dissociates when dissolved in water. Determine the concentration of the two ions in an aqueous solution of 1.20 M sodium phosphate.
 
 
Question 41
The ionic compound potassium phosphate is a strong electrolyte that completely dissociates when dissolved in water. Determine the concentration of the two ions in an aqueous solution of 1.50 M potassium phosphate.
 
 
Question 42
The ionic compound lithium phosphate is a strong electrolyte that completely dissociates when dissolved in water. Determine the concentration of the two ions in an aqueous solution of 1.80 M lithium phosphate.
 
 
 
Question Group 15
Question 43
The ionic compound aluminum chloride is a strong electrolyte that completely dissociates when dissolved in water. Determine the concentration of the two ions in an aqueous solution of 1.20 M aluminum chloride.
 
 
Question 44
The ionic compound iron(III) chloride is a strong electrolyte that completely dissociates when dissolved in water. Determine the concentration of the two ions in an aqueous solution of 1.00 M iron(III) chloride.
 
 
Question 45
The ionic compound chromium(III) chloride is a strong electrolyte that completely dissociates when dissolved in water. Determine the concentration of the two ions in an aqueous solution of 1.80 M chromium(III) chloride.
 
 
 
 
Question Group 16
Question 46
The ionic compound aluminum sulfate is a strong electrolyte that completely dissociates when dissolved in water. Determine the concentration of the two ions in an aqueous solution of 0.90 M aluminum sulfate.
 
 
Question 47
The ionic compound iron(III) sulfate is a strong electrolyte that completely dissociates when dissolved in water. Determine the concentration of the two ions in an aqueous solution of 0.90 M iron (III) sulfate.
 
 
Question 48
The ionic compound chromium(III) sulfate is a strong electrolyte that completely dissociates when dissolved in water. Determine the concentration of the two ions in an aqueous solution of 1.20 M chromium(III) sulfate.
 
 
 
 
Question Group 17
Question 49
The ionic compound ammonium sulfate is a strong electrolyte that completely dissociates when dissolved in water. Determine the concentration of the two ions in an aqueous solution of 1.20 M ammonium sulfate.
 
 
Question 50
The ionic compound ammonium sulfite is a strong electrolyte that completely dissociates when dissolved in water. Determine the concentration of the two ions in an aqueous solution of 1.60 M ammonium sulfite.
 
 
Question 51
The ionic compound ammonium sulfide is a strong electrolyte that completely dissociates when dissolved in water. Determine the concentration of the two ions in an aqueous solution of 1.80 M ammonium sulfide.
 
 
 
 
Question Group 18
Question 52
The ionic compound lithium carbonate is a strong electrolyte that completely dissociates when dissolved in water. Determine the concentration of the two ions in an aqueous solution of 1.20 M lithium carbonate.
 
 
Question 53
The ionic compound sodium carbonate is a strong electrolyte that completely dissociates when dissolved in water. Determine the concentration of the two ions in an aqueous solution of 1.50 M sodium carbonate.
 
 
Question 54
The ionic compound potassium carbonate is a strong electrolyte that completely dissociates when dissolved in water. Determine the concentration of the two ions in an aqueous solution of 1.80 M potassium carbonate.