Waec Model Questions Vol1 2023 Chemistry Question 16
Practice objective / multiple choice question 16 from the 2023 Waec Model Questions Vol1 Chemistry examination.
A 2.80 g sample of nitrogen gas (N₂) is passed over excess copper(II) oxide at 800 °C according to the reaction N₂ + 2 CuO → 2 NO + 2 Cu. The NO formed is then oxidised completely by oxygen: 2 NO + O₂ → 2 NO₂. The NO₂ is absorbed in 250.0 mL of water, producing nitric acid (HNO₃) and nitrous acid (HNO₂) in a 3 : 1 molar ratio. Assuming complete absorption and that HNO₃ dissociates completely while HNO₂ dissociates with Ka = 4.5 × 10⁻⁴, calculate the pH of the resulting solution. Give your answer to two decimal places.
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About This Question
This is Waec Model Questions Vol1 2023 Chemistry Question 16. It is one of the objective questions from the 2023 Waec Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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