Question 3: Write the ionic equation for the reaction between dilute hydrochloric acid and zinc. Zn(s) + 2HCl(aq) → ZnCl₂(aq) + H₂(g)
Model answer: Full ionic form: Zn(s) + 2H⁺(aq) + 2Cl⁻(aq) → Zn²⁺(aq) + 2Cl⁻(aq) + H₂(g) Remove spectator ions (Cl⁻): Ionic equation: Zn(s) + 2H⁺(aq) → Zn²⁺(aq) + H₂(g)
Conclusion
Chemical formulae and equations are the grammar of chemistry — every calculation, every reaction and every lab result depends on reading and writing them correctly. Nail these definitions and balancing becomes second nature.
For more Chemistry revision, read our posts on The Mole Concept key terms and [Stoichiometry and Rates of Reaction key terms]. Test yourself with our quiz app.