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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.

[2]

Transition metals, alloys and corrosion Questions

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

Practise Edexcel GCSE Chemistry Transition metals, alloys and corrosion with exam-style questions for Foundation and Higher tier. 97 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.

Question bank