1. Justify which of the following produces the lowest value of pH? 5.98) A) anil

Question

1. Justify which of the following produces the lowest value of pH? 5.98) A) aniline (pK 9.37) B)pyridine (pKb-8.75 C) nicotine (pK D) ammonia (pK,4.74) E) methylamine (pK 3.44) 2. Justify which of the following will have a conjugate acid with the lowest value of pH? A) aniline (pK9.37) B) pyridine (pK 8.75 C) nicotine (pK, 5.98) D) ammonia (pK-4.74) E) methylamine (pK 3.44) 3. What is the pH of 0.25 M HC,H302 (Ka = 9.0 x 10-6) Justify any assumptions . What is the pH of 0.25 M CH,O (Important: notice the relation of this chemical to the one in the previous question Justify any assumptions

Explanation / Answer

Ans 1 : a) aniline (pkb=9.37)

pkb = -log kb

kb represent the basic strength of the solutions.

So higher the kb , higher is the basicity and higher is the pH.

Lower the pKb , higher the basicity and higher is the pH.

So the lowest value of pH here will be of aniline , which has maximum value of pkb.

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