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Edexcel IGCSE Chemistry 2.31 Recycling metals

Practise linking acidic and alkaline solutions to the ions present in water, including formulae for H+ and OH- in pH questions.

Syllabus
First assessment 2019
Course
Chemistry 4CH1

Exam points

  • give the ion formula responsible for acidic or alkaline pH, using H+ or OH-
  • explain why HCl changes litmus only when water lets H+ ions form

2.31 Acids and alkalis in water question 1

[Maximum number: 1]

Sodium hydroxide dissolves in water, forming a strongly alkaline solution.
Ammonia dissolves in water, forming a slightly less alkaline solution.

Identify the ion that makes the sodium hydroxide solution alkaline.

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