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What is the pH of a solution containing 0.12 mol/L of NH4Cl and 0.03 mol/L of...

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Chemistry

What is the pH of a solution containing 0.12 mol/L of NH4Cl and0.03 mol/L of NaOH (pka of NH4+/NH3 is 9.25)?

Answer & Explanation Solved by verified expert
4.0 Ratings (454 Votes)

NH4+Cl-   + NaOH   ---> NH3 + H2O + NaCl

0.12               0.03            0                                        initial

0.09                  0              0.03                                   final

it forms bufferr.

pH= pKa + log {[NH3]/ [NH4Cl]}

pH = 9 .25 + log (0.03/0.09)

     =9.25 + (-0.48)

      = 8.77

Answer: 8.77
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