50.3 MB (50.0 MB compressed)
5138 x 3425 pixels
43.4 x 29.0 cm ⏐ 17.1 x 11.4 in (300dpi)
MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY
Salt and chalk in beakers of water. Salt (sodium chloride, NaCl) is soluble in water (left) and so dissolves to form a colourless solution. Chalk (calcium carbonate, CaCO3) is insoluble in water (right) and so forms a cloudy white suspension, where the chalk particles are evenly dispersed throughout the liquid but do not dissolve.
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