MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY
Reading the level of potassium permanganate in a burette. When titrating potassium permanganate, a very dark liquid, the burette reading is taken from the top of the meniscus (the curved surface of a liquid in a vessel). The start level is at left and the end level at right.
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