15分化學高深問題求高手

NH3 本身叫ammonia gas.
但係佢係一隻好soluble in water ge gas..
佢會變成咁...
NH3 +H2O <> NH4+ + OH- ( reversible)
因為你用緊ge ammonia 係 aqueous ge狀態...
所以NH3 實情係 NH4OH
NH4+ 係cation, OH-就係anion
情怳就會變成NaOH
H2SO4 +2NaOH >>>Na2SO4 +2H2O
H2SO4 +2NH4OH>>>(NH4)2SO4+2H2O

結論: 佢係neutralization.

CHCL3 ge 密度係 1.48 g/cm3
H2O ge 密度係 1.00g/ cm3
所以Chloroform 係會沉底ge
p.s 好多Cl Br and I compounds ge density都係大過一ga。
因為個solute 同 solvent ge M 實在差太遠...
所以solute係咩,係ge dense都好..都應該唔會影響到個solvent ge擺位~~

S2O8 2-
oxidation number of S = +6

Structure of S2O8 2-大約係咁:
O- O-
| |
O=S－O－O－S=O
|| ||
O O

所以oxidation number係 2+2+1+1 =+6

2008-03-08 11:19:09 補充：
我唔知道點解幅圖會咁..樣衰...
不過用文字解都得ge...

S2O8 2-
係由兩個SO4 2- combine埋ge
係iodometric titration ge時候成日會見到d 2個thiosulphate合體...
因為從中會走出兩粒e-出黎~~

毎個SO4 2- 提供一個O- 變成 -O-O- bond (peroxide)
所以呢個O ge oxidation number 就係-1

double bond ge O係2-
O- ge 係-1 (我相信你應該get到呢d...)
所以
oxidation number of S= 2+2+1+1=+6

希望幫到你~~