Key Facts: Solubility Rules

Part of Making Salts · Section 6 of 13

Key FactsUnit: Chemical ChangesGCSE

You need to know which salts are soluble and which are insoluble:

SOLUBLE (dissolve in water) INSOLUBLE (don't dissolve)
  • All sodium, potassium, and ammonium salts
  • All nitrates
  • Most chlorides (except silver and lead)
  • Most sulfates (except barium, calcium, lead)
  • Silver chloride (AgCl) — white precipitate
  • Barium sulfate (BaSO₄) — white precipitate
  • Lead iodide (PbI₂) — yellow precipitate
  • Most hydroxides (except Na, K, Ca)

This key facts covers Key Facts: Solubility Rules 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 6 of 13 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.

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

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Making Insoluble Salts by Precipitation

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