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6.1 Transition metals, alloys and corrosion

6.1 Transition metals, alloys and corrosion

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Question 58

Sodium sulfite (Na2SO3\text{Na}_2\text{SO}_3Na2​SO3​) is added to industrial boiler water to prevent internal corrosion of steel pipes. It reacts with dissolved oxygen:

2Na2SO3+O2→2Na2SO4 2\text{Na}_2\text{SO}_3 + \text{O}_2 \rightarrow 2\text{Na}_2\text{SO}_4 2Na2​SO3​+O2​→2Na2​SO4​

Steel pipes in untreated water corrode much faster than identical pipes in water containing dissolved sodium sulfite.

Use the equation and your scientific knowledge to explain how sodium sulfite reduces the rate of corrosion of steel.

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Markscheme

6.1 Transition metals, alloys and corrosion Questions

  1. GCSE
  2. /Chemistry
  3. /6.1 Transition metals, alloys and corrosion

97 exam-style questions on Edexcel GCSE Chemistry 6.1 Transition metals, alloys and corrosion, covering 6.1.1 Properties of transition metals, 6.1.2 Corrosion and its prevention, and 6.1.3 Alloys and the uses of metals. Each one has a worked solution and a mark scheme showing where the marks go.

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