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22.4 x 33.5 cm ⏐ 8.8 x 13.2 in (300dpi)
TREVOR CLIFFORD PHOTOGRAPHY / SCIENCE PHOTO LIBRARY TREVOR CLIFFORD PHOTOGRAPHY / SCIENCE PHOTO LIBRARY
Neutralisation titration. Burette (top) being used to slowly add measured amounts of an acid to an alkaline solution in a flask (bottom), containing a methyl orange pH indicator. As the solution becomes more and more acidic the indicator in the solution changes from yellow to orange and then red.
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