49.6 MB (2.7 MB compressed)
3386 x 5123 pixels
28.7 x 43.4 cm ⏐ 11.3 x 17.1 in (300dpi)
GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY
Copper sulphide precipitate, 2 of 3. Copper sulphide (CuS) precipitate (dark indigo) formed by adding 0.25 M solution of copper sulphate (CuSO4) drop by drop to 0.25 M solution of sodium sulphide (Na2S). The reaction is Na2S + CuSO4 -> CuS + Na2SO4. This is an example of a double replacement reaction.
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