Lead sulfide precipitate. Lead sulfide (PbS) precipitate (black) formed by adding 0.25 M solution of lead nitrate (Pb(NO3)2) drop by drop to 0.25 M solution of sodium sulfide (Na2S). The reaction is Na2S + Pb(NO3)2 -> PbS + NaNO3. This is an example of a double replacement reaction.

px px dpi = cm x cm = MB
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TOP22305719

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達志影像

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RM

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