e.
Below are the answers to practical exercises. (reference paragraphs 2-5--2-
6.)
(1) 20 g
(2) 0.625 g
(3) 151.4 g
(4) 0.5 g
(5) 12,500 ml
(6) 13.5 g
(7) (c)
(8) (b)
(9) (b)
x = 0.1%
(10) (a)
Solution:
g =
xg
1000 ml
100 ml.
Remember: Percent means parts per 100 ml.
(b)
0.04%
(c)
0.0025%
(11)
0.5 ml phenol
20 ml alcohol
1.0 g tragacanth
0.2 g aluminum sulfate
(12)
(a)
2.4%
(b)
0.0761% (can be rounded to 0.08%)
(13)
(a)
0.06 g
(b)
12 ml
(14) 18.16 g zinc oxide
36.32 g sulfur
(15) 90 g wool fat
30 ml water
(16) 600 mg
(17) (a)
24 mg
(b) 12 ml
MD0802
2-22