how to you tell the difference between cations ( Al3+ and Pb2+ ions), as in when you are testing them? is there a way to tell the difference between the results?
2006-10-29 23:53:19 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
you can try Na2S sodium sulfide where Pb will form black ppt but Al wont react
2006-10-30 00:50:35 · answer #1 · answered by source_of_love_69 3 · 0⤊ 0⤋
You can try adding aqueous NaCl inside... If Pb2+ is present, a white ppt of PbCl2 will be formed... If it's Al3+, no ppt would be formed...
Of course, that's after using aqueous NaOH(white ppt, soluble in excess NaOH) and aqueous NH3(white ppt, insoluble in excess NH3).
Note: The tests are conducted seperately from each other.
2006-10-29 23:59:10 · answer #2 · answered by klwh_88 2 · 0⤊ 0⤋
Al3+ is ppt by an alkaline mdium say NaOH whereas Pb2+ by H2S.
2006-10-30 00:29:29 · answer #3 · answered by ag_iitkgp 7 · 0⤊ 0⤋
Use an EDTA titration curve. Consult your quantitative analysis reference book for the details.
2006-10-30 00:29:16 · answer #4 · answered by Treebeard 2 · 0⤊ 0⤋