ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY
Metal hydroxides formed by the addition of sodium hydroxide (NaOH) to solutions of metal ions. From left are precipitates of iron (Fe2+), (Fe3+), copper (Cu2+) and nickel (Ni2+). The addition of sodium hydroxide is used to identify metal ions in solution, as the resulting precipitates have unique characteristics, such as colour and solubility.
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