What will happen if:Pb(𝐍𝐎𝟑)𝟐(aq) and KI(aq) are mixed?Guideline1. Write the molecular equation2. Write the ionic equation3. Write the net ionic equation4. What is the driving force?
Question
What will happen if:Pb(𝐍𝐎𝟑)𝟐(aq) and KI(aq) are mixed?Guideline1. Write the molecular equation2. Write the ionic equation3. Write the net ionic equation4. What is the driving force?
Solution
- Molecular Equation: When Lead Nitrate (Pb(NO3)2) and Potassium Iodide (KI) are mixed, they undergo a double displacement reaction to form Lead Iodide (PbI2) and Potassium Nitrate (KNO3). The molecular equation is:
Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq)
- Ionic Equation: In the ionic equation, we break all the aqueous substances into their respective ions:
Pb2+(aq) + 2NO3-(aq) + 2K+(aq) + 2I-(aq) → PbI2(s) + 2K+(aq) + 2NO3-(aq)
- Net Ionic Equation: The net ionic equation is obtained by cancelling out the spectator ions (ions that do not participate in the reaction) from the ionic equation. Here, the spectator ions are K+ and NO3-. So, the net ionic equation is:
Pb2+(aq) + 2I-(aq) → PbI2(s)
- Driving Force: The driving force of this reaction is the formation of a solid precipitate, Lead Iodide (PbI2). In a double displacement reaction, the driving force could be the formation of a precipitate, a gas, or a water molecule. In this case, it is the formation of a precipitate.
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