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Chemistry (including Biochemistry)/iron sulfate heptahydrate in water

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Expert: - 6/11/2004


Question
Hi,

I am a graduate student making up medium for some bacteria. I was wonding about a stock solution that I made. It is 0.1 g/L FeSO4.7H20, the water consisted of deionized water. I made it on 5/27/04 and placed it in the refrigerator for safe keeping. When I took it out on 6/8/04 I noticed that there was sediment on the bottom of the glass bottle. Is this solution still good to use?

Thanks so so so much,
Diana G.

Answer
Depending on what the next step is, it should be ok, if the next step is mixing with other solutions.  You should shake it up well or gently reheat to get dissolution.  Also, make sure it is FeSO4 you need.  Most bacteria media take MgSO4, FeS, and ferrous ammonium sufate.  I don't remember a ferrous sulfate.

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Chemistry (non-biochemistry), environmental science, occupational health and safety, environmental regulation and management, environmental engineering, and wastewater engineering. I'm the Director of Environmental, Health, and Safety and the Director of Research at the Institute of Textile Technology.

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Chemistry (non-biochemistry), environmental science, occupational health and safety, environmental regulation and management, environmental engineering, and wastewater engineering. I'm the Director of Environmental, Health, and Safety and the Director of Research at the Institute of Textile Technology.

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PhD, MS, BS in Chemistry

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