Problem: What is the pH of 0.10M diethylamine, (CH3CH2)2NH, (Kb=8.6x10-4)?

FREE Expert Solution

Equilibrium reaction:        (CH3CH2)2NH(aq) + H2O(l)  (CH3CH2)2NH2+(aq) + OH-(aq)

Step 1: Construct an ICE chart for the reaction.

Step 2: Write the Kb expression and calculate for Kb.


Solids and liquids are not included in the expression

Step 3: Calculate the equilibrium concentrations.


We cannot remove (–x) from the equation

8.6×10-4 (0.10-x)=x20.10-x(0.10-x)8.6×10-5-(8.6×10-4)x=x20=x2+(8.6×10-4)x-8.6×10-5


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Problem Details

What is the pH of 0.10M diethylamine, (CH3CH2)2NH, (Kb=8.6x10-4)?

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