20.
none. (para 2-10b(2)(b))
21.
DPO. (para 2-10c(2))
22.
DPD tablet. (para 2-10d(2))
23.
natural color of water. (para 2-11)
24.
30 minutes. (paras 2-12a(8), 2-13b(5))
25.
8 or 16 drops, depending whether the water is clear or cloudy. (para2-13c(2))
End of Lesson 2
MD0160
2-30