Chemistry Year 12 - Module 6 - Lesson 11
★ IQ2 Mastery — pH Calculations, Mixing & Band 6 Explanations
1. Key Ideas
Three students have each been given a different acid solution and asked to calculate the pH. Each has chosen a different method. Only one method is correct for their acid. Before reading on — can you identify which student has chosen the right method, and precisely why each wrong method fails?
- The decision tree: strong/weak → acid/base → given concentration or Ka → select method
- Why method selection depends on what information is given and what is asked
2. Success Criteria
By the end, you should be able to:
- The decision tree: strong/weak → acid/base → given concentration or Ka → select method
- Common error patterns in IQ2 calculations and their diagnoses
- The six strong acids: HCl, H₂SO₄ (1st), HNO₃, HClO₄, HBr, HI
3. Key Terms
4. Activity: Build the Lesson Map
Use the lesson to complete the table. Keep answers brief but specific.
| Prompt | Your answer |
|---|---|
| Main concept | |
| Important example | |
| Common mistake to avoid | |
| How this links to the next lesson |
5. Short Answer Questions
1. Explain this lesson goal in your own words: "The decision tree: strong/weak → acid/base → given concentration or Ka → select method". Use one specific example from the lesson.
2. Apply this idea to a new example: "Common error patterns in IQ2 calculations and their diagnoses". Show your reasoning clearly.
3. Analyse why this idea matters for understanding ★ IQ2 Mastery — pH Calculations, Mixing & Band 6 Explanations: "The six strong acids: HCl, H₂SO₄ (1st), HNO₃, HClO₄, HBr, HI".
6. Extend: Apply the Idea
A student gives a memorised answer about ★ IQ2 Mastery — pH Calculations, Mixing & Band 6 Explanations but does not use evidence or reasoning.
Improve the answer by writing a stronger response that uses accurate terminology, a relevant example and a clear explanation.
7. Multiple Choice
1. What is the best first step when answering a question about ★ IQ2 Mastery — pH Calculations, Mixing & Band 6 Explanations?
A. Identify the key concept being tested
B. Write every fact from memory
C. Ignore the command word
D. Skip examples and evidence
2. Which answer would show stronger understanding of ★ IQ2 Mastery — pH Calculations, Mixing & Band 6 Explanations?
A. An answer with accurate terms and reasoning
B. A copied definition only
C. A single-word response
D. An answer with no example
3. What should you do if a question asks you to explain?
A. Link the idea to a reason or cause
B. List unrelated facts
C. Only draw a diagram
D. Write the shortest possible answer
8. Success Criteria Proof
Finish with evidence that you can do each success criterion.