Jawabanmu

2014-06-17T23:42:43+07:00
5.
a.
H2SO4 0,4 M
H2SO4 ⇒ 2H+ + SO4^2-
H+ = 2 x M = 2 x 0,4 = 8 x 10^-1
pH = 1 -log 8

b. 
CH3COOH 0,1 M ( Ka = 10^-5 )
CH3COOH ⇒ CH3COO- + H+
H+ =  \sqrt{Ka.Ma}  \sqrt{10^{-5} . 10^-1} =  \sqrt{10^{-6}}  = 10^{-3}
pH = 3

c. 
NaOH 0,2 M
NaOH ⇒ Na+ OH-
0,2         0,2    0,2
OH- = 0,2 = 2x10^-1
pOH = 1-log 2
pH= 13 + log 2

d.
NH4OH 0,1 M 9K (Kb- 10^-5)
NH4OH ⇒ NH4+ + OH-
OH- =  \sqrt{Kb . M} =  \sqrt{10^{-5} .10^{-1}}  =  \sqrt{10^{-6}} = 10^{-3}
pOH = 3
pH = 11

No 4 kurang tahu, nanti kalau udah tahu, jawabanya saya tambahin disini ya kak.