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Sagot :
Answer:
MgCO3(s) + 2 H^+(aq) → Mg^2+(aq) + CO2(g) + H2O(l)
Explanation:
To find the balanced net ionic equation for the reaction between solid magnesium carbonate (MgCO3) and hydrochloric acid (HCl), which produces magnesium chloride (MgCl2), carbon dioxide gas (CO2), and water (H2O), follow these steps:
1. Write the complete molecular equation:
MgCO3(s) + 2 HCl(aq) → MgCl2(aq) + CO2(g) + H2O(l)
2. Identify the strong electrolytes (compounds that dissociate completely in aqueous solution):
- Hydrochloric acid (HCl) dissociates into H^+ and Cl^-
- Magnesium chloride (MgCl2) dissociates into Mg^2+ and 2 Cl^-
- Magnesium carbonate (MgCO3) does not significantly dissociate in water (it's a solid)
- Carbon dioxide (CO2) and water (H2O) are molecular substances and do not dissociate.
3. Write the complete ionic equation by representing all strong electrolytes as ions:
MgCO3(s) + 2 H^+(aq) + 2 Cl^-(aq) → Mg^2+(aq) + 2 Cl^-(aq) + CO2(g) + H2O(l)
4. Cancel out spectator ions (ions that appear on both sides of the equation):
MgCO3(s) + 2 H^+(aq) → Mg^2+(aq) + CO2(g) + H2O(l)
5. Write the balanced net ionic equation:
MgCO3(s) + 2 H^+(aq) → Mg^2+(aq) + CO2(g) + H2O(l)
This equation focuses on the ions and molecules directly involved in the chemical change, omitting spectator ions.
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