Table 1 Qualitative data from reactions of positively charged metal ions with dilute sodium hydroxide. Cations Zn Ca Al Pb+ Cu Fe Fe Table 2 Qualitative data from reactions of positively charged metal ions with a dilute ammonia. Zn Cations Ca A Pb Cu Observations After adding few drops of NaOH After adding a large excess of NaOH Fe Fe Observations After adding few drops of NH,(aq) After adding a large excess of NH,(aq)