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Learning objective

Explain trends in solubility of Group 2 hydroxides and sulfates.

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Topic

Group 2, the alkaline earth metals

Subtopic

Group 2 trends and reactions

Aqa A Level ChemistryInorganic chemistry

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Quick explanation

Explain trends in solubility of Group 2 hydroxides and sulfates

  • This point belongs to Group 2, the alkaline earth metals, especially Group 2 trends and reactions.
  • You need to be able to explain trends in solubility of Group 2 hydroxides and sulfates.
  • The key ideas to know are solubility, sulfate, and hydroxide.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

solubilitysulfatehydroxideGroup 2

Why it matters

This objective helps connect Group 2 trends and reactions to exam-style questions, flashcards, and revision notes for Group 2, the alkaline earth metals.

Quick student answer

Which of the following Group 2 hydroxides is the most soluble in water?

Direct answer

Ba(OH)₂

Key terms

  • Lattice enthalpy: The energy required to separate one mole of a solid ionic compound into its gaseous ions.
  • Hydration enthalpy: The energy change when one mole of gaseous ions is dissolved in water.

Common trap

Confusing solubility trends: Remember that the solubility of Group 2 sulfates actually decreases down the group.

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