Question

Which of the following would be the best choice for preparing a buffer with a pH = 3.5?

	a.	a solution of formic acid and sodium formate, Ka = 1.8 × 10−4
	b.	a solution of acetic acid and sodium acetate, Ka = 1.8 × 10−5
	c.	a solution of hypochlorous acid and sodium hypochlorite, Ka = 3.5 × 10−8
	d.	a solution of boric acid and sodium borate, Ka = 5.8 × 10−10
	e.	All of these solutions would be equally good choices for making this buffer.