Practice Double Displacement in Chemistry

Use these practice problems to test your method after reviewing the concept explanation and worked examples.

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Quick Recap

A double displacement (or metathesis) reaction occurs when two ionic compounds in solution exchange partners: AB + CD → AD + CB.

Two couples swap partners at a dance — each positive ion pairs with the other's negative ion.

Showing a random 20 of 50 problems.

Example 1

medium
Complete and balance: K2CO3+CaCl2→K_2CO_3 + CaCl_2 \rightarrow ?

Example 2

medium
Predict products and balance: FeCl3+NaOH→FeCl_3 + NaOH \rightarrow ?

Example 3

medium
Identify the precipitate when Pb(NO3)2\text{Pb(NO}_3)_2(aq) is mixed with KCl\text{KCl}(aq), and write the balanced equation.

Example 4

medium
Balance: Ba(OH)2+H3PO4→Ba3(PO4)2+H2O\text{Ba(OH)}_2 + \text{H}_3\text{PO}_4 \rightarrow \text{Ba}_3(\text{PO}_4)_2 + \text{H}_2\text{O}.

Example 5

easy
List three driving forces that make a double displacement reaction go forward.

Example 6

medium
Predict and balance: AgNO3+Na2S→\text{AgNO}_3 + \text{Na}_2\text{S} \rightarrow ?

Example 7

challenge
Mixing 25.0 mL of 0.10 M AgNO3_3 with 25.0 mL of 0.040 M Na2_2CrO4_4 gives Ag2_2CrO4_4 precipitate (M=331.7M=331.7). Find limiting reactant and mass of precipitate.

Example 8

easy
Classify: AgNO3+NaCl→AgCl+NaNO3AgNO_3 + NaCl \rightarrow AgCl + NaNO_3. What type?

Example 9

hard
50.0 mL of 0.100 M BaCl2_2 is mixed with 50.0 mL of 0.100 M Na2_2SO4_4. What mass of BaSO4_4 (M=233M=233) precipitates?

Example 10

medium
In HCl+NaHCO3→NaCl+H2O+CO2\text{HCl} + \text{NaHCO}_3 \rightarrow \text{NaCl} + \text{H}_2\text{O} + \text{CO}_2, what is the driving force?

Example 11

easy
Classify: Na2S+ZnCl2→2NaCl+ZnS\text{Na}_2\text{S} + \text{ZnCl}_2 \rightarrow 2\text{NaCl} + \text{ZnS}.

Example 12

easy
If both products of a swap are soluble and no gas/water forms, what happens?

Example 13

easy
Classify: HCl+NaOH→NaCl+H2O\text{HCl} + \text{NaOH} \rightarrow \text{NaCl} + \text{H}_2\text{O}.

Example 14

hard
How many grams of AgCl (M=143.3M=143.3) precipitate when 0.50 mol AgNO3_3 reacts with excess NaCl?

Example 15

medium
Balance: Al2(SO4)3+BaCl2→AlCl3+BaSO4Al_2(SO_4)_3 + BaCl_2 \rightarrow AlCl_3 + BaSO_4.

Example 16

medium
Identify whether H2SO4+2KOH→K2SO4+2H2OH_2SO_4 + 2KOH \rightarrow K_2SO_4 + 2H_2O is double displacement.

Example 17

hard
Why is the reaction CaCl2+2NaCl→CaCl2+2NaCl\text{CaCl}_2 + 2\text{NaCl} \rightarrow \text{CaCl}_2 + 2\text{NaCl} NOT a double displacement reaction?

Example 18

medium
Why does mixing AgNO3AgNO_3 and NaCl react but mixing NaNO3NaNO_3 and KCl does not?

Example 19

easy
Mixing KNO3\text{KNO}_3(aq) and NaCl\text{NaCl}(aq). Does a reaction occur?

Example 20

challenge
Mixing 0.10 mol BaCl2BaCl_2 with 0.10 mol Na2SO4Na_2SO_4: mol BaSO4BaSO_4 (M=233) precipitate and its mass?
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