GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY
Silver sulphide precipitate, 1 of 3. Silver sulphide (Ag2S) precipitate (black) formed by adding 0.2 M solution of silver nitrate (AgNO3) drop by drop to 0.25 M solution of sodium sulphide (Na2S). The reaction is Na2S + AgNO3 -> Ag2S + NaNO3. This is an example of a double replacement reaction.
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