Question 1
What mass of sodium nitrite must be added to 350. mL of water to give a solution with pH = 8.40? [K
a(HNO
2) = 5.6 × 10
–4]
◦ 68 g
◦ 1.7 × 10
–4 g
◦ 0.039 g
◦ 8.3 g
◦ 24 g
Question 2
When comparing acid strength of binary acids HX, as X varies within a particular group of the periodic table, which
one of these factors dominates in affecting the acid strength?
◦ bond strength
◦ electron withdrawing effects
◦ percent ionic character of the H–X bond
◦ solubility
◦ Le Châtelier's principle