CHEMISTRY · Single correct · A Level · Chemistry · Acids and bases · Acids and bases
Problem
To prepare a buffer at pH 3.34, a student plans to use 0.200 mol of formic acid (pK_a = 3.74). How many moles of sodium formate must be added so the resulting solution attains the desired pH?
(a) 0.13 mol
(b) 0.50 mol
(c) 0.080 mol
(d) 0.10 mol