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RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA / SCIENCE PHOTO LIBRARY RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA / SCIENCE PHOTO LIBRARY
High-speed footage of a large chunk of sodium metal reacting violently in water. Initially shown in slow motion, the metals falls into the water, and turns the surrounding water pink. This is due to the acid-base indicator phenolphthalein in the water, which turns pink in contact with the sodium hydroxide formed in the reaction. In real time, the sodium heats up and melts, and the hydrogen that is also produced in the reaction catches fire. In slow motion again, the flame ignites a large pocket of the hydrogen gas, causing an explosion that destroys the water bath.
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