50.5 MB (3.3 MB compressed)
3418 x 5161 pixels
29.0 x 43.7 cm ⏐ 11.4 x 17.2 in (300dpi)
GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY
Cobalt chloride complexes. Two cobalt chloride (CoCl2) solutions in test tubes. On the right is a 0.5 M water solution. Cobalt ions are complexed with water ((Co(H2O)6)2+) resulting in pink-red colour. On the left, concentrated hydrochloric acid has been added to the water solution. Cobalt ions are complexed with chloride ions ((CoCl4)-) and the solution colour changes to blue.
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