Students in Barbados collected data on the pH of rainfall over several months. The average pH recorded was 4.5. Which of the following statements BEST explains this reading?

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Question

Students in Barbados collected data on the pH of rainfall over several months. The average pH recorded was 4.5. Which of the following statements BEST explains this reading?

Accepted Answer

The rain is acidic due to dissolved gases from pollution — Award 1 mark for identifying acid rain. Normal rain has pH of approximately 5.6 (slightly acidic due to dissolved CO₂). A pH of 4.5 indicates acid rain caused by sulphur dioxide and nitrogen oxides dissolving to form sulphuric and nitric acids. A is incorrect — neutral pH is 7. B is incorrect — dust would not make rain alkaline. D is incorrect — oxygen does not cause acidity.

Answer

The rain is acidic due to dissolved gases from pollution

Answer

The rain is alkaline due to dust particles

Answer

The rain is acidic due to high oxygen content

Answer

The rain is neutral as expected

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