1
00:00:00,000 --> 00:00:11,599
0.9% NaCl 是 %w/v
每 100 mL 溶液含 0.9 g NaCl

2
00:00:11,599 --> 00:00:23,199
換成每公升
0.9 g/100 mL = 9.0 g/L

3
00:00:23,199 --> 00:00:34,799
再換成 M
9.0 / 58.44 = 0.154 M

4
00:00:34,799 --> 00:00:46,399
NaCl 會解離
Na+ 和 Cl- 讓粒子數接近加倍

5
00:00:46,399 --> 00:00:58,000
等張看粒子數
不是只看質量濃度