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Types of Amino Acids

pH of M / 100...

Question

pH of M/100 monoacidic base MOH having Kb = 4*10^(-4) is

A) 2.6990 B) 2.3010 C) 11.6990 D) 11.3010

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Solution

We can find the concentration of OH- from the expression
[OH-]=(KaC)^1/2
= (410^-40.01)1/2=2x10^-3
so pOH= -log [OH-]= -log[210^-3]=2.699
Hence pH of the solution is = 14-pOH= 14-2.699= 11.3 (approximately)

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