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→ ?

Example 2

medium
Predict products and balance: FeCl3+NaOH→ ?

Example 3

medium
Identify the precipitate when Pb(NO3)2(aq) is mixed with KCl(aq), and write the balanced equation.

Example 4

medium
Balance: Ba(OH)2+H3PO4→Ba3(PO4)2+H2O.

Example 5

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

Example 6

medium
Predict and balance: AgNO3+Na2S→ ?

Example 7

challenge
Mixing 25.0 mL of 0.10 M AgNO3 with 25.0 mL of 0.040 M Na2CrO4 gives Ag2CrO4 precipitate (M=331.7). Find limiting reactant and mass of precipitate.

Example 8

easy
Classify: AgNO3+NaCl→AgCl+NaNO3. What type?

Example 9

hard
50.0 mL of 0.100 M BaCl2 is mixed with 50.0 mL of 0.100 M Na2SO4. What mass of BaSO4 (M=233) precipitates?

Example 10

medium
In HCl+NaHCO3→NaCl+H2O+CO2, what is the driving force?

Example 11

easy
Classify: Na2S+ZnCl2→2NaCl+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.

Example 14

hard
How many grams of AgCl (M=143.3) precipitate when 0.50 mol AgNO3 reacts with excess NaCl?

Example 15

medium
Balance: Al2(SO4)3+BaCl2→AlCl3+BaSO4.

Example 16

medium
Identify whether H2SO4+2KOH→K2SO4+2H2O is double displacement.

Example 17

hard
Why is the reaction CaCl2+2NaCl→CaCl2+2NaCl NOT a double displacement reaction?

Example 18

medium
Why does mixing AgNO3 and NaCl react but mixing NaNO3 and KCl does not?

Example 19

easy
Mixing KNO3(aq) and NaCl(aq). Does a reaction occur?

Example 20

challenge
Mixing 0.10 mol BaCl2 with 0.10 mol Na2SO4: mol BaSO4 (M=233) precipitate and its mass?
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