A beaker with 115 mL of an acetic acid buffer with a pH of 5.000
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Chemistry
A beaker with 115 mL of an acetic acid buffer with a pH of 5.000is sitting on a bench top. The total molarity of acid and conjugatebase in this buffer is 0.100 M. A student adds 4.80 mL of a 0.420 MHCl solution to the beaker. How much will the pH change? The pKa ofacetic acid is 4.740. Express your answer numerically to twodecimal places. Use a minus ( − ) sign if the pH has decreased.
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change in pH 031 Explanation Given total molarity of acid and conjugate base 0100 M acetic acid acetate 0100 M 1 According to Henderson Hasselbalch equation pH pKa logconjugate base weak acid pH pKa logacetate acetic acid 5000 4740 logacetate acetic acid logacetate acetic
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