Question 1
50.00 mL of 0.10 M HNO
2 (nitrous acid, K
a = 4.5 × 10
–4) is titrated with a 0.10 M KOH solution. After 25.00 mL of the KOH solution is added, the pH in the titration flask will be
◦ 2.17
◦ 3.35
◦ 2.41
◦ 1.48
◦ 7.00
Question 2
A saturated sodium carbonate solution at 0°C contains 7.1 g of dissolved sodium carbonate per 100. mL of solution. The solubility product constant for sodium carbonate at this temperature is
◦ 1.2
◦ 0.30
◦ 3.0 × 10
–4◦ 0.90
◦ 1.2 × 10
–3