Double Displacement Reaction

 A double displacement reaction, also known as a double replacement reaction or a metathesis reaction, is a type of chemical reaction where the positive ions (cations) and negative ions (anions) in two compounds switch places to form new compounds. Let's break down this process with simple words and provide 20 examples.


1. Sodium sulfate and barium chloride:

   - Sodium sulfate (Na2SO4) + Barium chloride (BaCl2) -> Barium sulfate (BaSO4) + Sodium chloride (NaCl)


2. Potassium iodide and lead nitrate:

   - Potassium iodide (KI) + Lead nitrate (Pb(NO3)2) -> Lead iodide (PbI2) + Potassium nitrate (KNO3)


3. Sodium hydroxide and hydrochloric acid:

   - Sodium hydroxide (NaOH) + Hydrochloric acid (HCl) -> Sodium chloride (NaCl) + Water (H2O)


4. Silver nitrate and sodium chloride:

   - Silver nitrate (AgNO3) + Sodium chloride (NaCl) -> Silver chloride (AgCl) + Sodium nitrate (NaNO3)


5. Potassium sulfate and barium nitrate:

   - Potassium sulfate (K2SO4) + Barium nitrate (Ba(NO3)2) -> Barium sulfate (BaSO4) + Potassium nitrate (KNO3)


6. Copper sulfate and sodium hydroxide:

   - Copper sulfate (CuSO4) + Sodium hydroxide (NaOH) -> Copper hydroxide (Cu(OH)2) + Sodium sulfate (Na2SO4)


7. Potassium chloride and silver nitrate:

   - Potassium chloride (KCl) + Silver nitrate (AgNO3) -> Silver chloride (AgCl) + Potassium nitrate (KNO3)


8. Calcium carbonate and hydrochloric acid:

   - Calcium carbonate (CaCO3) + Hydrochloric acid (HCl) -> Calcium chloride (CaCl2) + Carbon dioxide (CO2) + Water (H2O)


9. Sodium carbonate and barium chloride:

   - Sodium carbonate (Na2CO3) + Barium chloride (BaCl2) -> Barium carbonate (BaCO3) + Sodium chloride (NaCl)


10. Potassium hydroxide and sulfuric acid:

    - Potassium hydroxide (KOH) + Sulfuric acid (H2SO4) -> Potassium sulfate (K2SO4) + Water (H2O)


11. Ammonium chloride and silver nitrate:

    - Ammonium chloride (NH4Cl) + Silver nitrate (AgNO3) -> Silver chloride (AgCl) + Ammonium nitrate (NH4NO3)


12. Barium sulfate and sodium carbonate:

    - Barium sulfate (BaSO4) + Sodium carbonate (Na2CO3) -> Barium carbonate (BaCO3) + Sodium sulfate (Na2SO4)


13. Potassium iodide and sodium bromide:

    - Potassium iodide (KI) + Sodium bromide (NaBr) -> Potassium bromide (KBr) + Sodium iodide (NaI)


14. Magnesium sulfate and sodium hydroxide:

    - Magnesium sulfate (MgSO4) + Sodium hydroxide (NaOH) -> Magnesium hydroxide (Mg(OH)2) + Sodium sulfate (Na2SO4)


15. Ammonium sulfate and barium chloride:

    - Ammonium sulfate (NH42SO4) + Barium chloride (BaCl2) -> Barium sulfate (BaSO4) + Ammonium chloride (NH4Cl)


16. Potassium nitrate and silver sulfate:

    - Potassium nitrate (KNO3) + Silver sulfate (Ag2SO4) -> Silver nitrate (AgNO3) + Potassium sulfate (K2SO4)


17. Sodium phosphate and calcium chloride:

    - Sodium phosphate (Na3PO4) + Calcium chloride (CaCl2) -> Calcium phosphate (Ca3(PO4)2) + Sodium chloride (NaCl)


18. Potassium hydroxide and nitric acid:

    - Potassium hydroxide (KOH) + Nitric acid (HNO3) -> Potassium nitrate (KNO3) + Water (H2O)


19. Ammonium hydroxide and hydrochloric acid:

    - Ammonium hydroxide (NH4OH) + Hydrochloric acid (HCl) -> Ammonium chloride (NH4Cl) + Water (H2O)


20. Potassium carbonate and calcium chloride:

    - Potassium carbonate (K2CO3) + Calcium chloride (CaCl2) -> Calcium carbonate (CaCO3) + Potassium chloride (KCl)


In all these examples, you can see that the positive ions (cations) and negative ions (anions) from two different compounds swap places, resulting in the formation of two new compounds. Double displacement reactions are common in chemistry and can be used to produce various useful substances or to identify the presence of specific ions in a solution.

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