Question

A beaker with 1.00×10² mL 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 0.100 M. A student adds 9.00 mL of a 0.430 M HCl 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.

Answer 1

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Page Na Date PH= 5-o Mmol of acid Ccoo) Pka 4.740 Giver 1ommol = loo x O 1OM mmot sf coniugte base(Ofcoo) 100xo1MO mmet 9ml o-430 M nelie. 9 xo.430 3.87 mmd. Studenb Gdd mmol of Hel_addod = 3.37 mmet utfer ie. Now acid genct with Conugale onae Crgco 1(mmol) C (mmt)38. E (mut) Hel 3.83 +3.89 -3-9a 13-89 6-13 =103m Total volume pka tlo New ptt Acid 6-13mmol/10gmt 13- m 1ogmi log 4.39 ApH old hew 4.39-5-O0 Apt--.61 ApH- Change i fH. CS Scannerdwith CamScanner