Neutralisation with Copper Carbonate

Curriculum Area

Subject: Science
Key Stage: KS3 (Year 8, Age 13)
Topic: Acids and Bases – Neutralisation
UK National Curriculum Link:

• Chemical Reactions: Reactions of acids with carbonates
• Experimental Skills: Conducting practical investigations safely

---

Lesson Objectives

By the end of this 50-minute lesson, students will be able to:

1. Describe neutralisation as a reaction between an acid and a base.
2. Observe and record the reaction between copper carbonate and sulphuric acid.
3. Explain the products of the reaction and their significance.
4. Apply their understanding to predict similar reactions.

---

Lesson Structure

Starter Activity (5 minutes) – Engaging Questioning

• Ask students: “What happens when you mix an acid with something like a carbonate?”
• Show a sealed bottle of a fizzy drink. Ask: “Where do the bubbles come from?”
• Explain today’s practical - reacting copper carbonate with sulphuric acid to form copper sulfate, water, and carbon dioxide.

---

Main Activity – Practical Experiment (30 minutes)

Equipment (per group of 4 students)

• Copper(II) carbonate (green powder)
• Dilute sulphuric acid (0.5M) (in a beaker)
• Measuring cylinder
• Glass stirring rod
• Dropper pipette
• Evaporating basin
• Bunsen burner & safety mat
• Tripod & gauze
• Filter funnel & filter paper
• Beaker (100ml)
• Test tube and delivery tube
• Limewater (calcium hydroxide solution)

Step-by-Step Instructions

1. Reaction Observation (10 minutes)

1. Wearing safety goggles, measure 25ml of dilute sulphuric acid into a beaker.
2. Add small amounts of copper(II) carbonate using a spatula and stir.
3. Observe the fizzing (effervescence)—this is carbon dioxide being released.

2. Gas Identification (5 minutes)

1. Place a delivery tube from the reaction beaker into a test tube containing limewater.
2. If the limewater turns cloudy, the gas produced is carbon dioxide.

3. Producing Copper Sulfate Crystals (10 minutes)

1. Filter the solution to remove any excess solid.
2. Heat the filtered solution gently using a Bunsen burner until some water evaporates.
3. Leave the solution to cool overnight, allowing blue copper sulfate crystals to form.

---

Discussion & Plenary (10 minutes)

Class Discussion (5 minutes)

• Ask: “What did you observe? Why did the bubbles form?”
• Encourage students to explain how neutralisation creates a salt and water.
• Discuss why copper carbonate is a base.

Exit Task (5 minutes) – Quick Quiz

1. What is the word equation for this reaction? (Sulphuric acid + Copper carbonate → Copper sulfate + Water + Carbon dioxide)
2. How do you know carbon dioxide is produced? (Limewater turns cloudy.)
3. What was left after the reaction? (Copper sulfate solution.)
4. How do we separate the salt crystals? (Evaporation.)
5. What type of reaction is this? (Neutralisation.)

---

Differentiation Strategies

✔ For Higher-Attaining Students: Ask them to write the balanced symbol equation:
H₂SO₄ + CuCO₃ → CuSO₄ + H₂O + CO₂
✔ For Lower-Attaining Students: Use a visual diagram showing reactants and products side by side.

---

Health & Safety Considerations

• Wear goggles at all times.
• Handle sulphuric acid carefully—low concentration used.
• Carbon dioxide in small amounts—ensure good ventilation.
• Bunsen burner safety—tie back hair and use heat mats.

---

Teacher Reflection Questions

• Did students engage with the practical?
• Were students able to link evidence (fizzing, colour change, gas test) to the reaction theory?
• Did all students actively participate in discussions?
• Would alternative visual aids help understanding next time?

---

Homework / Extension Activity

Research Task: Investigate another carbonate reaction with acid (e.g., sodium carbonate + hydrochloric acid).
Challenge: Could you test whether the copper sulfate solution is neutral using pH indicators?

---

Final Thought for Teachers

This lesson is designed to bring neutralisation to life through hands-on exploration. By integrating simple, structured experiments with engaging discussion, learners experience chemistry rather than just learning about it!