If 1 mM solution of ethylamine produces pH = 9, then the ionization constant ($K_b$) 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.]

Question

Dr. Abubacker · Accepted Answer

[Solution by Dr. Abubacker] $pOH=14-9=5$, so $[OH^-]=10^{-5}$ M. $K_b=\frac{[OH^-]^2}{C}=\frac{10^{-10}}{10^{-3}}=10^{-7}$, so $x=7$. Answer: 7.

Q. If 1 mM solution of ethylamine produces pH = 9, then the ionization constant ($K_b$) 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.]

Explanation

Reviewed by Dr. Abubacker

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