Nickel sulfide precipitate. Nickel sulfide (NiS) precipitate (black) formed by adding 0.25 M solution of nickel sulfate (NiSO4) drop by drop to 0.25 M solution of sodium sulfide (Na2S). The reaction is Na2S + NiSO4 -> NiS + Na2SO4. This is an example of a double replacement reaction.

px px dpi = cm x cm = MB
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TOP22305723

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達志影像

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RM

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