Waec Model Questions Vol1 2019 Chemistry Question 16
Practice objective / multiple choice question 16 from the 2019 Waec Model Questions Vol1 Chemistry examination.
Benzoic acid has a pK_a of 4.20. For a para‑nitro substituted benzoic acid the Hammett substituent constant σ_p for -NO₂ is +0.78 and the reaction constant ρ for the dissociation of benzoic acids is +1.0. Using the Hammett equation log(K/K₀)=ρσ, calculate the pK_a of p‑nitrobenzoic acid.
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This is Waec Model Questions Vol1 2019 Chemistry Question 16. It is one of the objective questions from the 2019 Waec Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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