71.4 MB (4.0 MB compressed)
7000 x 3564 pixels
59.2 x 30.2 cm ⏐ 23.3 x 11.9 in (300dpi)
GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY
Lead sulphide precipitate. Lead sulphide (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 sulphide (Na2S). The reaction is Na2S + Pb (NO3)2 -> PbS + NaNO3. This is an example of a double replacement reaction.
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