Sulfanilic acid, which is used in making dyes, is made by reacting aniline with sulfuric acid.

(a) Is aniline a Brønsted base, a Lewis base, or both? Explain, using its possible reactions with HCl, BF₃, or other acid.
(b) Sulfanilic acid has a pK_a value of 3.23. The sodium salt of the acid, Na(H₂NC₆H₄SO₃), is quite soluble in water. If you dissolve 1.25 g of the salt in water to give 125 mL of solution, what is the pH of the solution?

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H₂SO4(aq) + :N-H T H aniline SO3 H + H₂O(l) N-H T H sulfanilic acid