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Find the pH during the titration of 20.00 mL of 0.1000 M triethylamine, (CH3CH2)3N (Kb = 5.2 × 10-4 ), with 0.1000 M HCl solution after the following additions of titrant.

(a) 11.00 mL:

pH = 

(b) 20.60 mL:

pH = 

(c) 30.00 mL:

pH =

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