Mastering Chemistry Chapter 10-Google Chrome secure httpsllsession masteringchem

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Mastering Chemistry Chapter 10-Google Chrome secure httpsllsession masteringchemistry.com/myct/itemview?assignment ProblemID 76617801 1340 Spring 2017 Section 01 chapter 10 Problem 29 Problem 29 Part A The ammonia ammonium buffer system is used to optimize polymerase chain reactions (PCR) used in DNA studies. The equilibrium for this buffer can be written as NH4 (ag) 10 calculate the pHof a buffer that contains 002 M ammonium chloride and o 025 M a The Ka of ammonium is 5.6 x 10 Express your answer using two decimal places. pH- Submit My Answers Give Up m a y O

Explanation / Answer

pH = pKa + log (base/acid)

pKa = -log(Ka)

pKa = -log(5.6 x 10^-10)

pKa = 9.25

pH = 9.25 + log [ 0.035 / 0.025]

pH = 9.40

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