[ash2006rf]

Hi i work on titration of pb using Xylenol Orange tetrasodium salt
indicator for metal titration.
if any one he have idea about other indicator may i can use it instead . because its difficult for me to find this one.
thank you in advance
for further information will be ready.
Ash

[BetaAmyloid]

So...are you asking if there is something to be sure that there is lead in a solution? If so, you could use something like hydrochloric acid and a white precipitate would form that is PbCl₂ or PbCl₄. This would indicate the presence of lead, but I can't totally understand your question.

2HCl + Pb PbCl₂ + H₂ (for Pb²⁺)
4HCl + Pb PbCl₄ + 2H₂ (for Pb⁴⁺)

Hope this is what you were asking.

[csrscience.com]

Lead chloride is slightly soluble, and I think he is probably working on very dilute solutions so this probably wont work.

[BetaAmyloid]

Lead chloride is slightly soluble, and I think he is probably working on very dilute solutions so this probably wont work.

Yeah, that's what I'm not understanding. If it is high concentration of lead the precipitate will be obvious...if not, it won't be near as obvious or able to be seen at all. 

[Borek]

This is for titration, so reaction has to be quickly reversible and easy to observe.  Precipitation of chlorides won't work.