Jawabanmu

2014-04-10T17:54:12+07:00
PH = 9, pOH = 14-9 =5
maka, [OH⁻] = 10⁻⁵
 [OH⁻] = Kb . [basa lemah] / [ garam]
10⁻⁵ = 2x10⁻⁵ . [NH₃] / 0,1
0,1 x 10⁻⁵ = 2x10⁻⁵ [NH₃]
10⁻⁶ = 2x 10⁻⁵ [NH₃]
[NH₃] = 1x10⁻⁶ / 2x10⁻⁵
[NH₃] = 0,5 x 10⁻¹
[NH₃] = 0,05