a solution of ions forms preticipates after mixing with a solution of NaOH , adding an extra volume of NaOH redissolves the preticipate , why is this happening ?
2007-03-12 05:15:06 · 3 answers · asked by livefast_dieyoung 2 in Science & Mathematics ➔ Chemistry
The amphoteric nature of aluminium hydroxide is what you're on about. Look it up!
2007-03-12 05:29:55 · answer #1 · answered by Gervald F 7 · 0⤊ 0⤋
well tha twould happen when Al3+ is involved in a reaction with NaOH. as follows
Al + NaOH= Al(OH)3 PPT, then when you add extra NaOH the following rctn happns
Al(OH)3 + NaOH(excess)= Na(Al(OH)4).
and its a teterahedral complex. Na+1 , and Al3+ is the central atom, while four OH-1 are the ligands.
2007-03-12 05:50:11 · answer #2 · answered by mohammed.hamad 1 · 0⤊ 0⤋
For some metals, the metal hydroxide is insoluble and precipitates, but the metal ions can also form a coordination complex with additional hydroxide ions that is soluble.
2007-03-12 05:27:26 · answer #3 · answered by hcbiochem 7 · 0⤊ 0⤋