Jawabanmu

2014-06-05T02:53:28+07:00
POH = 9 + log 2
= - log 2.10^-5
Mr Ba(CH3COOH)2 = (137 + ( 12x4 ) + ( 1x8 ) + ( 16x4))
= (137 + 48 + 8 + 64)
= 257

[OH-] = √Kw/Ka x m/Mr x 1000/v
2.10^-5 = √10^-14/2.10x m/257 x 1000/100
4.10^-10 = 5.10^-10 x 10 x m/257 (10^-10 di ruas kanan dan kiri sama-sama dicoret)
4 x 257 = 50m
1028/50 = m
20,56 gram = m
ralat: H = 6 jadi total Mr= 255 jadi 4 x 255 = 50m lalu 1020/50 = m. Hasilnya m = 20,4 dan dikali 2 karena koefisiennya jadi m = 40,8 gram