Buffer and Water Comparison, 4 of 4

Buffer and Water Comparison, 4 of 4

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Caption: Buffer and water comparison, 4 of 4. pH of a buffer solution changes very little when a small or a moderate amount of an acid or a base is added to the buffer. 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).

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Keywords: acid, acidic, beaker, buffer, chemical, chemistry, hcl, hydrochloric acid, indicator, neutral, ph, ph indicator, sequence, series, solution, solutions, universal indicator

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