Each of the following aqueous solutions is 0.10 M at 25 °C

CHEMISTRY · Single correct · A Level · Chemistry · Acids and bases · Acids and bases

Problem

Each of the following aqueous solutions is 0.10 M at 25 °C. Which solution will have the lowest pH once equilibrium is established? (a) Formic acid (

pK_a = 3.75

) (b) Pyridine,

\mathrm{C_5H_5N}

(

pK_b = 8.77

) (c) Chloroacetic acid (

pK_a = 2.86

) (d) Acetic acid (

pK_a = 4.76

)