If 1 mM solution of ethylamine produces pH=9, then the ionization constant (Kb) of ethylamine is 10-x. The value of x is (nearest integer). [The degree of ionization of ethylamine can be neglected with respect to unity.]
7
Concept: Kb C 2 and [OH-]=C ⇒ Kb= [OH-]2C
pH=9 pOH=5 [OH-]=10-5 M, C=10-3 M
Kb= 10-1010-3=10-7 ⇒ x=7
Answer: 7
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