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22.6 x 33.8 cm ⏐ 8.9 x 13.3 in (300dpi)
TREVOR CLIFFORD PHOTOGRAPHY / SCIENCE PHOTO LIBRARY TREVOR CLIFFORD PHOTOGRAPHY / SCIENCE PHOTO LIBRARY
Neutralisation titration. Student using a burette (top) to slowly add measured amounts of an acid to an alkaline solution in a flask (centre), 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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