Question 1
Due to a highway accident, 150 L of concentrated hydrochloric acid (12.0 M) is released into a lake containing 5.0 × 10
5 m
3 of water. If the pH of this lake was 7.0 prior to the accident, what is the pH of the lake following the accident?
◦ 5.44
◦ 8.56
◦ 8.44
◦ 5.56
◦ 2.44
Question 2
For H
3PO
4, K
a1 = 7.3 × 10
–3, K
a2 = 6.2 × 10
–6, and K
a3 = 4.8 × 10
–13. An aqueous solution of NaH
2PO
4 therefore would be
◦ neutral
◦ basic
◦ acidic