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Buffer and Water Comparison, 4 of 4

Buffer and Water Comparison, 4 of 4

C030/8089

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50.7 MB (3.0 MB compressed)

5160 x 3437 pixels

43.7 x 29.2 cm ⏐ 17.2 x 11.5 in (300dpi)

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Credit

GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY

Caption

Buffer and water comparison, 4 of 4. Here, two beakers are filled with 40 mL of pH=7 buffer (left) and water (right). Universal indicator is added to both solutions. Initially the colour is green indicating that both solutions are neutral (Photo 1). Then 0.1 M hydrochloric acid (HCl) is added in increments of 1 mL to both solutions. After the first 1 mL of HCl, water changes its colour to red thus becoming acidic (Photo 2). It takes a total of 14 mL of HCl for the buffer to start changing its colour (Photo 3) and 17 mL to become acidic (Photo 4).

Release details

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