化學......

我諗到2個....但都唔係好熟....
1.nOH(-)+M (n+) ->M(OH)n
2.M (n+)+ m NH3 ->M[NH3]m (n+)

第一個係因為氨水係有NH4OH,所以會出現會考必讀既一個方程(好似無名.....)
好多金屬的氫氧化物都唔溶水...生成沉澱....

第二個係高考先有(講真我都唔知係唔係離子方程)
因為有空的軌態.....NH3既N原子既lone pair會同金屬離子既空軌態生成
配位共價鍵......NH3會用2粒電子同金屬離子共用...而金屬離子唔洗提供電子
要咁寫
M<--NH3
不過....唔會有以上結構.....
我記得起碼有3個,最多好似9個....

I think the ionic equations are not applicable in this case unless the metal ions are very oxidizing and it can oxidize the ammonia. However, there are still reaction between the ammonia solution and metal ions. In most case, since the ammonia solution is alkali, it can form hydroxide with the metal ions. Howver, if the ammonia solution is excess enough, some of the metals ions such as copper can form complexes with the excess ammonia molecule.