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)?
Engelbert Buxbaum
- Pb(NO3)2 is quite soluble in water, like most nitrates. Precipitation will occur if reagents are added that form insoluble salts with Pb, like H2S.
- It may be advisable to add a little nitric acid (say, 10 mM) to prevent formation of the hydroxyde, which is poorly soluble.
- Whether 1 g/L is sufficient to suppress growth of microorganisms I do not know, but the acid should take care of that too.
- Lead nitrate is not decomposed during storage, but it is somewhat hygroscopic and may draw water from room air. If you want to use your solution as standard for quantitative work, dry the salt before weighing and/or determine the exact titer.
- Lead compounds are hazardous, make sure you read and understand the material safety data sheet (MSDS).
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Uddipta Nath
How long it can be stored, whether it is a stock solution or standard solution?
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Engelbert Buxbaum
Almost indefinitely. Eventually the slow evaporation of water will change the concentration.
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