Sodium sulfide is soluble in water. Mercury sulfide is insoluble in water.Using this information, explain why sodium sulfide could be used to remove the mercury from the village's water supply.
Question
Sodium sulfide is soluble in water. Mercury sulfide is insoluble in water.Using this information, explain why sodium sulfide could be used to remove the mercury from the village's water supply.
Solution
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Sodium sulfide (Na2S) is soluble in water, meaning it can dissolve in water. When it does, it breaks down into its constituent ions, sodium (Na+) and sulfide (S2-).
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Mercury sulfide (HgS), on the other hand, is insoluble in water, meaning it does not dissolve in water and remains as solid particles.
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If sodium sulfide is added to a water supply contaminated with mercury, the sulfide ions (S2-) from the dissolved sodium sulfide will react with the mercury in the
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