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Chemical ChangesDeep Dive

Deep Dive: Choosing the Right Method

Part of Making Salts · GCSE GCSE Chemistry revision

This deep dive covers Deep Dive: Choosing the Right Method within Making Salts for GCSE Chemistry. Revise Making Salts in Chemical Changes for GCSE Chemistry with 20 exam-style questions and 20 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 3 of 13 in this topic. Use this deep dive to connect the idea to the wider topic before moving on to questions and flashcards.

Topic position

Section 3 of 13

Practice

20 questions

Recall

20 flashcards

🔬 Deep Dive: Choosing the Right Method

🎯 Soluble vs Insoluble Salts

The method you use depends on whether your salt dissolves in water. Most salts are soluble, but some are insoluble and need a different approach.

Soluble Salts Insoluble Salts

Made by reacting acid with:

  • Metal (if reactive enough)
  • Metal oxide
  • Metal hydroxide
  • Metal carbonate

Examples: copper sulfate, zinc chloride, sodium nitrate

Made by precipitation:

  • Mix two soluble salt solutions
  • Insoluble salt precipitates out
  • Filter to collect the solid

Examples: barium sulfate, lead iodide, silver chloride

Keep building this topic

Read this section alongside the surrounding pages in Making Salts. That gives you the full topic sequence instead of a single isolated revision point.

Three Methods of Making SaltsHow It Works: The Practical Method for Making Pure, Dry Salt CrystalsThe Art of Crystal GrowingRequired Practical: Preparing a Pure, Dry Sample of a Soluble Salt

Practice Questions for Making Salts

Which of the following is the correct method for making copper sulfate crystals from copper oxide and sulfuric acid?

  • A. Add excess copper oxide to acid, filter off unreacted solid, then evaporate to crystallise
  • B. Add excess acid to copper oxide, then boil to dryness
  • C. Use titration with an indicator to find the exact volumes, then repeat
  • D. Mix equal volumes of copper sulfate solution and sulfuric acid
1 markfoundation

Describe the steps involved in the required practical for preparing a pure, dry sample of copper sulfate crystals from copper oxide and dilute sulfuric acid.

4 marksstandard

Quick Recall Flashcards

What is crystallisation?
The process of forming solid crystals from a saturated solution
What colour is copper sulfate?
Blue (as crystals and in solution)

20 questions on Making Salts — practise free

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Three Methods of Making Salts

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How It Works: The Practical Method for Making Pure, Dry Salt Crystals