Gce Model Questions Vol1 2017 Chemistry Question 28
Practice objective / multiple choice question 28 from the 2017 Gce Model Questions Vol1 Chemistry examination.
Rainwater forms when atmospheric gases dissolve in water. The partial pressure of CO₂ is \(4.0 \times 10^{-4}\) atm and its Henry's law constant is \(k_H = 3.3 \times 10^{-2}\ \text{mol L}^{-1}\text{atm}^{-1}\). CO₂ hydrates to give carbonic acid with first dissociation constant \(K_{a1}=4.3 \times 10^{-7}\). The partial pressure of SO₂ is \(1.0 \times 10^{-5}\) atm and its Henry's law constant is \(k_H = 1.2\ \text{mol L}^{-1}\text{atm}^{-1}\); the first dissociation constant of H₂SO₃ is \(K_a = 1.2 \times 10^{-2}\). Assuming both acids dissociate independently and activity coefficients are unity, calculate the pH of the resulting rainwater.
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This is Gce Model Questions Vol1 2017 Chemistry Question 28. It is one of the objective questions from the 2017 Gce Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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