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A beaker with 135mL of an acetic acid buffer with a pH of 5.000 is sitting on a benchtop. The total molarity of acid and

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A beaker with 135mL of an acetic acid buffer with a pH of 5.000 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.100M. A student adds 4.30mL of a 0.470MHCl solution to the beaker. How much will the pH change? The pKa of acetic acid is 4.740. Express your answer numerically to two decimal places. Use a minus ( ) sign if the pH has decreased

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