How Many Grams of Pyridine Are There in 100 ML

question 20

Multiple Choice

How many grams of pyridine are there in 100 mL of an aqueous solution that has a pH of 9.00? The K_b for pyridine is 1.9 × 10^-9 and the equation of interest is C₅H₅N(aq) + H₂O(l) ⇌ C₅H₅NH⁺(aq) + OH^-(aq) .

• A)0.053 g
• B)0.42 g
• C)0.79 g
• D)7.9 g

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