I want to prepare 1000 ppm lead nitrate stock solution in distilled water. I am concern that storing it for a brief period say, 4-5 days or 1 week may lead to precipitation of lead. Please explain me in detail,

a) how to store lead nitrate stock solution without precipitating?

b) Whether pH of the solution matters?

c) Do I need to store the solution in an acidic condition?

d) Does the quality of lead nitrate matters, (lead nitrate available with me is manufactured in 2011)?

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