[DSE CHEM] 寫邊條equation啱？／你哋prefer以下邊條 ?

其實下方比較正確的,這precipitation是Al(NO3)3加入氨水(ammonia hydroxide)NH4OH,而且NH3+水已經等同NH4OH
正確的ionic equation:Al3+ + 3OH- = Al(OH)3

不，上方的才是比較合理
Al(NO3)3 + 3 NH3 + 3 H2O = Al(OH)3 + 3 NH4NO3

First, the ammonia in ammonia solution mainly exists in molecular form (since ammonia is a weak base), not "ammonium hydroxide".

Second, ammonium ion is the spectator ion. Writing ammonium ion in both reactant side & product is redundant.
The upper equation includes only compounds, which is good.
The lower equation includes both compounds & ions which is strange: if you insists writing "NH4(+) + OH(-)", then aluminium nitrate should also be written like "Al(3+) + 3NO3(-)", and the product ammonium nitrate as "NH4(+) + NO3(-)".