Question
Asked Oct 17, 2019
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Calculate the pH at 25°C of a 0.74M solution of ammonium bromide NH4Br. Note that ammonia NH3 is a weak base with a pKb of 4.75. Round your answer to 1 decimal place.

 

 

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Expert Answer

Step 1

The concentration of NH4Br = 0.74 M

The reaction taking place in the system, and equilibrium reaction can be written as follows,

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Step 2

Ka can be calculated from Kb as below.

pKa  = 14 – pKb = 14 – 4.75 = 9.25

Ka  = (10)- pKa = (10)- 9.25 = 5.6 x ...

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Equilibrium Concepts

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