Jawabanmu

2014-07-19T18:50:36+07:00
M = n/v
= M/(mr.v)
= 0,4/(40.0,5)
= 2.10⁻²

-log [OH⁻] = pOH
- log 2.10⁻² = pOH
2 -log 2 = pOH
12 + log 2 = pH

^_^